Common Weakness Enumeration
CWE-670
Allowed-with-ReviewAlways-Incorrect Control Flow Implementation
Abstraction: Class · Status: Draft
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
98 vulnerabilities reference this CWE, most recent first.
CVE-2026-41527 (GCVE-0-2026-41527)
Vulnerability from cvelistv5 – Published: 2026-04-21 00:00 – Updated: 2026-04-22 15:35
VLAI
EPSS
VEX
Summary
KDE Kleopatra before 26.08.0 on Windows allows local users to obtain the privileges of a Kleopatra user, because there is an error in the mechanism (KUniqueService) for ensuring that only one instance is running.
Severity
6.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 12:58 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
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CVE-2026-40960 (GCVE-0-2026-40960)
Vulnerability from cvelistv5 – Published: 2026-04-16 00:54 – Updated: 2026-04-16 12:31
VLAI
EPSS
VEX
Summary
Luanti 5 before 5.15.2 sometimes allows unintended access to an insecure environment. If at least one mod is listed as secure.trusted_mods or secure.http_mods, then a crafted mod can intercept the request for the insecure environment or HTTP API, and also receive access to it.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 12:22 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
Impacted products
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CVE-2026-40942 (GCVE-0-2026-40942)
Vulnerability from cvelistv5 – Published: 2026-04-21 21:09 – Updated: 2026-04-22 18:11
VLAI
EPSS
VEX
Title
DSF: Inverted Time Comparison in OIDC JWKS and Token Cache
Summary
The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider. The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired. This vulnerability is fixed in 2.1.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 17:52 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/datasharingframework/dsf/secur… | x_refsource_CONFIRM |
| https://github.com/datasharingframework/dsf/commi… | x_refsource_MISC |
| https://github.com/datasharingframework/dsf/commi… | x_refsource_MISC |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| datasharingframework | dsf |
Affected:
< 2.1.0
|
|
| dev.dsf | dsf-bpe-process-api-v2 |
Affected:
< 2.1.0
|
|
| dev.dsf | dsf-bpe-server |
Affected:
< 2.1.0
|
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CVE-2026-40719 (GCVE-0-2026-40719)
Vulnerability from cvelistv5 – Published: 2026-04-15 06:23 – Updated: 2026-04-15 13:22
VLAI
EPSS
VEX
Summary
Deadwood in MaraDNS 3.5.0036 allows attackers to exhaust connection slots via a zone whose authoritative nameserver address cannot be resolved.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 13:22 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
2 references
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CVE-2026-40396 (GCVE-0-2026-40396)
Vulnerability from cvelistv5 – Published: 2026-04-12 19:23 – Updated: 2026-04-13 15:35
VLAI
EPSS
VEX
Summary
Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service (daemon panic) after timeout_linger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread (timeout_linger) and resume traffic before the session is closed (timeout_idle) sending more than one request at once to trigger a pipelining operation between requests. This vulnerability affecting Varnish Cache 9.0.0 emerged from a port of the Varnish Enterprise non-blocking architecture for HTTP/2. New code was needed to adapt to a more recent workspace API that formalizes the pipelining operation. In addition to the workspace change on the Varnish Cache side, other differences created merge conflicts, like partial support for trailers in Varnish Enterprise. The conflict resolution missed one code path configuring pipelining to perform a complete workspace rollback, losing the guarantee that prefetched data would fit inside workspace_client during the transition from one request to the next. This can result in a workspace overflow, triggering a panic and crashing the Varnish server.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 15:35 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
9.0.0 , < 9.0.1
(semver)
cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:* |
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CVE-2026-40394 (GCVE-0-2026-40394)
Vulnerability from cvelistv5 – Published: 2026-04-12 19:17 – Updated: 2026-04-13 15:45
VLAI
EPSS
VEX
Summary
Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service (daemon panic) for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is repurposed as stream zero. During the upgrade, a buffer allocation is made to reserve space to send frames to the client. This allocation would split the original workspace, and depending on the amount of prefetched data, the next fetch could perform a pipelining operation that would run out of workspace.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 15:45 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
9.0.0 , < 9.0.1
(semver)
cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:* |
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CVE-2026-40200 (GCVE-0-2026-40200)
Vulnerability from cvelistv5 – Published: 2026-04-10 00:00 – Updated: 2026-04-14 14:32
VLAI
EPSS
VEX
Summary
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Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-14 14:31 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
Impacted products
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CVE-2026-35414 (GCVE-0-2026-35414)
Vulnerability from cvelistv5 – Published: 2026-04-02 17:08 – Updated: 2026-04-02 18:17
VLAI
EPSS
VEX
Summary
OpenSSH before 10.3 mishandles the authorized_keys principals option in uncommon scenarios involving a principals list in conjunction with a Certificate Authority that makes certain use of comma characters.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 17:42 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
References
Impacted products
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CVE-2026-35387 (GCVE-0-2026-35387)
Vulnerability from cvelistv5 – Published: 2026-04-02 16:52 – Updated: 2026-04-03 13:07
VLAI
EPSS
VEX
Summary
OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-03 13:07 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
mitre
CNA
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Impacted products
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CVE-2026-35343 (GCVE-0-2026-35343)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:07 – Updated: 2026-04-22 18:05
VLAI
EPSS
VEX
Title
uutils coreutils cut Inconsistent Output Suppression with Newline Delimiters
Summary
The cut utility in uutils coreutils incorrectly handles the -s (only-delimited) option when a newline character is specified as the delimiter. The implementation fails to verify the only_delimited flag in the cut_fields_newline_char_delim function, causing the utility to print non-delimited lines that should have been suppressed. This can lead to unexpected data being passed to downstream scripts that rely on strict output filtering.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 18:05 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
canonical
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/pull/11143 | patchissue-tracking |
| https://github.com/uutils/coreutils/releases/tag/0.7.0 | vendor-advisory |
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"cweId": "CWE-670",
"description": "CWE-670: Always-Incorrect Control Flow Implementation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-22T16:07:44.261Z",
"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
"shortName": "canonical"
},
"references": [
{
"tags": [
"patch",
"issue-tracking"
],
"url": "https://github.com/uutils/coreutils/pull/11143"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://github.com/uutils/coreutils/releases/tag/0.7.0"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "uutils coreutils cut Inconsistent Output Suppression with Newline Delimiters"
}
},
"cveMetadata": {
"assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
"assignerShortName": "canonical",
"cveId": "CVE-2026-35343",
"datePublished": "2026-04-22T16:07:44.261Z",
"dateReserved": "2026-04-02T12:58:56.087Z",
"dateUpdated": "2026-04-22T18:05:43.468Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.