Refine your search
2 vulnerabilities found for coreruleset by coreruleset
CVE-2026-33691 (GCVE-0-2026-33691)
Vulnerability from cvelistv5
Published
2026-04-02 15:03
Modified
2026-04-18 19:16
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-178 - Improper Handling of Case Sensitivity
Summary
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.
References
| URL | Tags | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| coreruleset | coreruleset |
Version: < 3.3.9 Version: >= 4.0.0-rc1, < 4.25.0 |
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-04-18T19:16:54.006Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/03/29/2"
},
{
"url": "http://seclists.org/fulldisclosure/2026/Apr/0"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/04/18/4"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-33691",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-02T17:38:01.007742Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T17:38:10.247Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "coreruleset",
"vendor": "coreruleset",
"versions": [
{
"status": "affected",
"version": "\u003c 3.3.9"
},
{
"status": "affected",
"version": "\u003e= 4.0.0-rc1, \u003c 4.25.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-178",
"description": "CWE-178: Improper Handling of Case Sensitivity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T15:03:52.126Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w"
},
{
"name": "https://github.com/coreruleset/coreruleset/pull/4546",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/pull/4546"
},
{
"name": "https://github.com/coreruleset/coreruleset/pull/4547",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/pull/4547"
},
{
"name": "https://github.com/coreruleset/coreruleset/pull/4548",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/pull/4548"
},
{
"name": "https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02"
},
{
"name": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9"
},
{
"name": "https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0"
}
],
"source": {
"advisory": "GHSA-rw5f-9w43-gv2w",
"discovery": "UNKNOWN"
},
"title": "OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-33691",
"datePublished": "2026-04-02T15:03:52.126Z",
"dateReserved": "2026-03-23T16:34:59.932Z",
"dateUpdated": "2026-04-18T19:16:54.006Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-21876 (GCVE-0-2026-21876)
Vulnerability from cvelistv5
Published
2026-01-08 13:55
Modified
2026-04-09 15:41
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-794 - Incomplete Filtering of Multiple Instances of Special Elements
Summary
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.
References
| URL | Tags | |
|---|---|---|
|
|
||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| coreruleset | coreruleset |
Version: < 4.22.0 Version: < 3.3.8 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-21876",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-08T14:52:48.615550Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-09T15:41:17.073Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/daytriftnewgen/CVE-2026-21876"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "coreruleset",
"vendor": "coreruleset",
"versions": [
{
"status": "affected",
"version": "\u003c 4.22.0"
},
{
"status": "affected",
"version": "\u003c 3.3.8"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-794",
"description": "CWE-794: Incomplete Filtering of Multiple Instances of Special Elements",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-08T13:55:37.102Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-36fv-25j3-r2c5",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-36fv-25j3-r2c5"
},
{
"name": "https://github.com/coreruleset/coreruleset/commit/80d80473abf71bd49bf6d3c1ab221e3c74e4eb83",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/commit/80d80473abf71bd49bf6d3c1ab221e3c74e4eb83"
},
{
"name": "https://github.com/coreruleset/coreruleset/commit/9917985de09a6cf38b3261faf9105e909d67a7d6",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/commit/9917985de09a6cf38b3261faf9105e909d67a7d6"
},
{
"name": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.8",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.8"
},
{
"name": "https://github.com/coreruleset/coreruleset/releases/tag/v4.22.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coreruleset/coreruleset/releases/tag/v4.22.0"
}
],
"source": {
"advisory": "GHSA-36fv-25j3-r2c5",
"discovery": "UNKNOWN"
},
"title": "OWASP CRS has multipart bypass using multiple content-type parts"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-21876",
"datePublished": "2026-01-08T13:55:37.102Z",
"dateReserved": "2026-01-05T17:24:36.927Z",
"dateUpdated": "2026-04-09T15:41:17.073Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}