Common Weakness Enumeration
CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
2353 vulnerabilities reference this CWE, most recent first.
CVE-2026-94397 (GCVE-0-2026-94397)
Vulnerability from cvelistv5 – Published: 2026-09-26 20:42 – Updated: 2026-09-26 22:59
VLAI
EPSS
VEX
Title
Uncontrolled Resource Consumption in Elasticsearch Leading to denial of service
Summary
Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-26 22:59 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
elastic
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Elastic | Elasticsearch |
Affected:
8.0.0 , ≤ 8.19.21
(semver)
Affected: 9.0.0 , ≤ 9.4.6 (semver) Affected: 9.5.0 , ≤ 9.5.3 (semver) |
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CVE-2026-94396 (GCVE-0-2026-94396)
Vulnerability from cvelistv5 – Published: 2026-09-26 20:42 – Updated: 2026-09-26 22:59
VLAI
EPSS
VEX
Title
Uncontrolled Resource Consumption in Elasticsearch Leading to denial of service
Summary
Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-26 22:59 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
elastic
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Elastic | Elasticsearch |
Affected:
9.2.0 , ≤ 9.4.6
(semver)
Affected: 9.5.0 , ≤ 9.5.3 (semver) |
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CVE-2026-93879 (GCVE-0-2026-93879)
Vulnerability from cvelistv5 – Published: 2026-11-08 18:47 – Updated: 2026-11-09 14:10
VLAI
EPSS
VEX
Title
Hibernate Validator is affected by an expression language injection vulnerability
Summary
Hibernate Validator could allow a remote attacker to cause a denial of service due to uncontrolled resource consumption resulting from improper escaping of user-controlled data in Expression Language (EL) expressions.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 14:10 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
ibm
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7293301 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Hibernate Validator |
Affected:
5.4.1.Final , ≤ 6.2.5.Final
(semver)
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CVE-2026-93679 (GCVE-0-2026-93679)
Vulnerability from cvelistv5 – Published: 2026-10-07 00:00 – Updated: 2026-10-07 16:18
VLAI
EPSS
VEX
Title
Langflow OSS is affected by multiple vulnerabilities
Summary
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to cause a denial of service due to uncontrolled resource consumption during ZIP file extraction.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 16:17 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
ibm
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7290694 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Langflow OSS |
Affected:
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CVE-2026-93590 (GCVE-0-2026-93590)
Vulnerability from cvelistv5 – Published: 2026-09-18 13:20 – Updated: 2026-09-21 20:52
VLAI
EPSS
VEX
Title
ImageMagick before 7.1.2-31 Policy Bypass in UHDR encoder
Summary
ImageMagick before 7.1.2-31 contains a policy bypass vulnerability in the UHDR encoder that fails to perform policy checks during buffer allocation for image pixels. Attackers can bypass resource policies by processing specially crafted UHDR images, potentially causing denial of service through excessive memory allocation.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 16:22 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
VulnCheck
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ImageMagick/ImageMagick/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/imagemagick-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ImageMagick | ImageMagick |
Affected:
0 , < 7.1.2-31
(semver)
Unaffected: 7.1.2-31 (semver) cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:* |
Date Public
2026-09-03 00:00
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CVE-2026-93587 (GCVE-0-2026-93587)
Vulnerability from cvelistv5 – Published: 2026-09-18 13:20 – Updated: 2026-10-29 21:17
VLAI
EPSS
VEX
Title
ImageMagick before 7.1.2-31 Policy Bypass via PCD decoder
Summary
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Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 18:05 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
VulnCheck
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ImageMagick/ImageMagick/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/imagemagick-… | third-party-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| ImageMagick | ImageMagick |
Affected:
7.0.0 , < 7.1.2-31
(semver)
Unaffected: 7.1.2-31 (semver) |
|
| ImageMagick | ImageMagick |
Affected:
0 , < 6.9.13-56
(semver)
Unaffected: 6.9.13-56 (semver) |
Date Public
2026-09-03 00:00
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CVE-2026-93441 (GCVE-0-2026-93441)
Vulnerability from cvelistv5 – Published: 2026-10-20 21:51 – Updated: 2026-10-26 17:37
VLAI
EPSS
VEX
Title
IBM QRadar SIEM HTTP Receiver protocol is vulnerable to a denial of service
Summary
IBM QRadar SIEM could allow a remote attacker to cause a denial of service due to uncontrolled resource consumption.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 17:28 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
ibm
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7292244 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | QRadar Security Information and Event Management |
Affected:
7.4-20210823144546 , ≤ 7.5-20260930064858
(custom)
Affected: 7.6-20260330053257 , ≤ 7.6-20260930064910 (custom) cpe:2.3:a:ibm:qradar_security_information_and_event_management:http:*:*:*:*:*:*:* |
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"value": "\u003cp\u003eIBM strongly encourages customers to update their systems promptly.\u003c/p\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003eProduct\u003c/td\u003e\u003ctd\u003eProtocol\u003c/td\u003e\u003ctd\u003eVersion\u003c/td\u003e\u003ctd\u003eFix\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003eIBM QRadar SIEM\u003c/td\u003e\u003ctd\u003eHTTP Receiver\u003c/td\u003e\u003ctd\u003e\u00a07.5\u003c/td\u003e\u003ctd\u003e\u003ca href=\"https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=IBM%20Security\u0026amp;product=ibm/Other+software/IBM+Security+QRadar+SIEM\u0026amp;release=All\u0026amp;platform=Linux\u0026amp;function=fixId\u0026amp;fixids=7.5.0-QRADAR-DSM-JuniperJunOS-7.5-20260826070157.noarch.rpm,7.5.0-QRADAR-PROTOCOL-HTTPReceiver-7.5-20260930064859.noarch.rpm,7.6.0-QRADAR-DSM-CitrixNetScaler-7.6-20261005125714.noarch.rpm,7.6.0-QRADAR-DSM-ArubaMobility-7.6-20261005061312.noarch.rpm,7.6.0-QRADAR-DSM-JuniperJunOS-7.6-20260826070207.noarch.rpm,7.6.0-QRADAR-DSM-CiscoMeraki-7.6-20260908194712.noarch.rpm,7.5.0-QRADAR-DSM-AmazonAWSALBAccessLogs-7.5-20260928060353.noarch.rpm,7.6.0-QRADAR-DSM-AmazonAWSALBAccessLogs-7.6-20260928060405.noarch.rpm,7.5.0-QRADAR-DSM-CiscoMeraki-7.5-20260908194704.noarch.rpm,7.5.0-QRADAR-DSM-CiscoIronPort-7.5-20260928155658.noarch.rpm,7.6.0-QRADAR-PROTOCOL-HTTPReceiver-7.6-20260930064911.noarch.rpm,7.5.0-QRADAR-DSM-ArubaMobility-7.5-20261003162837.noarch.rpm,7.6.0-QRADAR-DSM-BarracudaWebApplicationFirewall-7.6-20260813063016.noarch.rpm,7.6.0-QRADAR-DSM-CiscoIronPort-7.6-20260929090932.noarch.rpm,7.5.0-QRADAR-DSM-BarracudaWebApplicationFirewall-7.5-20260811152834.noarch.rpm,7.5.0-QRADAR-DSM-CitrixNetScaler-7.5-20261005110756.noarch.rpm\u0026amp;includeSupersedes=0\u0026amp;source=fc\" rel=\"nofollow\"\u003ePROTOCOL-HTTPReceiver-7.5-20260930064859.noarch.rpm\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003eIBM QRadar SIEM\u003c/td\u003e\u003ctd\u003eHTTP Receiver\u003c/td\u003e\u003ctd\u003e\u00a07.6\u003c/td\u003e\u003ctd\u003e\u003ca href=\"https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=IBM%20Security\u0026amp;product=ibm/Other+software/IBM+Security+QRadar+SIEM\u0026amp;release=All\u0026amp;platform=Linux\u0026amp;function=fixId\u0026amp;fixids=7.5.0-QRADAR-DSM-JuniperJunOS-7.5-20260826070157.noarch.rpm,7.5.0-QRADAR-PROTOCOL-HTTPReceiver-7.5-20260930064859.noarch.rpm,7.6.0-QRADAR-DSM-CitrixNetScaler-7.6-20261005125714.noarch.rpm,7.6.0-QRADAR-DSM-ArubaMobility-7.6-20261005061312.noarch.rpm,7.6.0-QRADAR-DSM-JuniperJunOS-7.6-20260826070207.noarch.rpm,7.6.0-QRADAR-DSM-CiscoMeraki-7.6-20260908194712.noarch.rpm,7.5.0-QRADAR-DSM-AmazonAWSALBAccessLogs-7.5-20260928060353.noarch.rpm,7.6.0-QRADAR-DSM-AmazonAWSALBAccessLogs-7.6-20260928060405.noarch.rpm,7.5.0-QRADAR-DSM-CiscoMeraki-7.5-20260908194704.noarch.rpm,7.5.0-QRADAR-DSM-CiscoIronPort-7.5-20260928155658.noarch.rpm,7.6.0-QRADAR-PROTOCOL-HTTPReceiver-7.6-20260930064911.noarch.rpm,7.5.0-QRADAR-DSM-ArubaMobility-7.5-20261003162837.noarch.rpm,7.6.0-QRADAR-DSM-BarracudaWebApplicationFirewall-7.6-20260813063016.noarch.rpm,7.6.0-QRADAR-DSM-CiscoIronPort-7.6-20260929090932.noarch.rpm,7.5.0-QRADAR-DSM-BarracudaWebApplicationFirewall-7.5-20260811152834.noarch.rpm,7.5.0-QRADAR-DSM-CitrixNetScaler-7.5-20261005110756.noarch.rpm\u0026amp;includeSupersedes=0\u0026amp;source=fc\" rel=\"nofollow\"\u003ePROTOCOL-HTTPReceiver-7.6-20260930064911.noarch.rpm\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/table\u003e\u003c/div\u003e\u003c/div\u003e\u003cp\u003eThese RPMs will be updated as part of \u003ca href=\"https://www.ibm.com/docs/en/qsip/7.6.0?topic=tasks-automatic-updates\" rel=\"noopener noreferrer nofollow\"\u003eQRadar Auto Update\u003c/a\u003e where enabled.\u003c/p\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e"
}
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}
],
"title": "IBM QRadar SIEM HTTP Receiver protocol is vulnerable to a denial of service"
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"cveId": "CVE-2026-93441",
"datePublished": "2026-10-20T21:51:16.499Z",
"dateReserved": "2026-09-17T22:03:39.454Z",
"dateUpdated": "2026-10-26T17:37:11.672Z",
"state": "PUBLISHED"
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CVE-2026-93310 (GCVE-0-2026-93310)
Vulnerability from cvelistv5 – Published: 2026-09-18 00:00 – Updated: 2026-09-18 19:59
VLAI
EPSS
VEX
Title
O-RAN-SC SMO OAM VES Collector allocation of resources
Summary
A vulnerability was identified in O-RAN-SC SMO OAM 2025-06-10. This affects an unknown part of the component VES Collector. The manipulation leads to allocation of resources. Remote exploitation of the attack is possible. The exploit is publicly available and might be used. The project was informed of the problem early through a bug report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 19:59 UTC
Assigner
VulDB
CNA
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/406596 | vdb-entry |
| https://vuldb.com/vuln/406596/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-93310 | third-party-advisory |
| https://vuldb.com/submit/942313 | third-party-advisory |
| https://lf-o-ran-sc.atlassian.net/browse/SMO-204 | related |
| https://gist.github.com/fklement/f70321f38513c2e8… | exploit |
Impacted products
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CVE-2026-93309 (GCVE-0-2026-93309)
Vulnerability from cvelistv5 – Published: 2026-09-17 23:30 – Updated: 2026-09-22 02:00
VLAI
EPSS
VEX
Title
O-RAN-SC SMO OAM VES Collector allocation of resources
Summary
A vulnerability was determined in O-RAN-SC SMO OAM 2025-06-10. Affected by this issue is some unknown functionality of the component VES Collector. Executing a manipulation can lead to allocation of resources. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through a bug report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 02:00 UTC
Assigner
VulDB
CNA
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/406595 | vdb-entry |
| https://vuldb.com/vuln/406595/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-93309 | third-party-advisory |
| https://vuldb.com/submit/942312 | third-party-advisory |
| https://lf-o-ran-sc.atlassian.net/browse/SMO-203 | related |
| https://gist.github.com/fklement/639eb04a12cc5c01… | exploit |
Impacted products
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CVE-2026-93308 (GCVE-0-2026-93308)
Vulnerability from cvelistv5 – Published: 2026-09-17 23:15 – Updated: 2026-09-18 12:59
VLAI
EPSS
VEX
Title
O-RAN-SC SMO OAM VES Collector allocation of resources
Summary
A vulnerability was found in O-RAN-SC SMO OAM 2025-06-10. Affected by this vulnerability is an unknown functionality of the component VES Collector. Performing a manipulation results in allocation of resources. The attack may be initiated remotely. The exploit has been made public and could be used. The project was informed of the problem early through a bug report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 12:59 UTC
Assigner
VulDB
CNA
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/406594 | vdb-entry |
| https://vuldb.com/vuln/406594/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-93308 | third-party-advisory |
| https://vuldb.com/submit/942311 | third-party-advisory |
| https://lf-o-ran-sc.atlassian.net/browse/SMO-202 | related |
| https://gist.github.com/fklement/9f217219b95f7ced… | exploit |
Impacted products
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"timestamp": "2026-09-18T12:59:04.605135Z",
"version": "2.0.3"
},
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"dateUpdated": "2026-09-18T12:59:16.466Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:o-ran-sc:smo_oam:*:*:*:*:*:*:*:*"
],
"modules": [
"VES Collector"
],
"product": "SMO OAM",
"vendor": "O-RAN-SC",
"versions": [
{
"status": "affected",
"version": "2025-06-10"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "fklement (VulDB User)"
},
{
"lang": "en",
"type": "coordinator",
"value": "VulDB CNA Team"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability was found in O-RAN-SC SMO OAM 2025-06-10. Affected by this vulnerability is an unknown functionality of the component VES Collector. Performing a manipulation results in allocation of resources. The attack may be initiated remotely. The exploit has been made public and could be used. The project was informed of the problem early through a bug report but has not responded yet."
}
],
"metrics": [
{
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"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
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},
{
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"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "Allocation of Resources",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "Resource Consumption",
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}
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"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
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"references": [
{
"name": "VDB-406594 | O-RAN-SC SMO OAM VES Collector allocation of resources",
"tags": [
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"url": "https://vuldb.com/vuln/406594"
},
{
"name": "VDB-406594 | CTI Indicators (IOB, IOC, TTP)",
"tags": [
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"url": "https://vuldb.com/vuln/406594/cti"
},
{
"name": "CVE-2026-93308 | CVE Analysis and Report",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/cve/CVE-2026-93308"
},
{
"name": "Submit #942311 | O-RAN-SC SMO L-Release CWE-770 Allocation of Resources Without Limits or Throttling",
"tags": [
"third-party-advisory"
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"url": "https://vuldb.com/submit/942311"
},
{
"tags": [
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],
"url": "https://lf-o-ran-sc.atlassian.net/browse/SMO-202"
},
{
"tags": [
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],
"url": "https://gist.github.com/fklement/9f217219b95f7ced94527a2d18b5f059"
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"timeline": [
{
"lang": "en",
"time": "2026-09-17T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-09-17T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-09-17T19:11:16.000Z",
"value": "VulDB entry last update"
}
],
"title": "O-RAN-SC SMO OAM VES Collector allocation of resources",
"x_generator": [
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]
}
},
"cveMetadata": {
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"cveId": "CVE-2026-93308",
"datePublished": "2026-09-17T23:15:13.993Z",
"dateReserved": "2026-09-17T17:05:44.260Z",
"dateUpdated": "2026-09-18T12:59:16.466Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
Mitigation
Architecture and Design
- Mitigation of resource exhaustion attacks requires that the target system either:
- The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
- The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- recognizes the attack and denies that user further access for a given amount of time, or
- uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
Mitigation
Implementation
Ensure that all failures in resource allocation place the system into a safe posture.
CAPEC-147: XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
CAPEC-227: Sustained Client Engagement
An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.