CVE-2026-126191

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-126191", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-10T20:07:44.957Z", "datePublished": "2026-11-12T16:57:01.566Z", "dateUpdated": "2026-11-12T16:57:01.566Z"}, "containers": {"cna": {"title": "Soup Sieve: Exponential ReDoS in selector compilation via \\9-run in CSS_ESCAPES/IDENTIFIER", "problemTypes": [{"descriptions": [{"cweId": "CWE-1333", "lang": "en", "description": "CWE-1333: Inefficient Regular Expression Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-6655-6qjp-jx7x", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-6655-6qjp-jx7x"}, {"name": "https://github.com/facelessuser/soupsieve/pull/300", "tags": ["x_refsource_MISC"], "url": "https://github.com/facelessuser/soupsieve/pull/300"}, {"name": "https://github.com/facelessuser/soupsieve/commit/dbfa2854ff31a863326bd6660d4e55c6f068db9e", "tags": ["x_refsource_MISC"], "url": "https://github.com/facelessuser/soupsieve/commit/dbfa2854ff31a863326bd6660d4e55c6f068db9e"}, {"name": "https://github.com/facelessuser/soupsieve/releases/tag/3.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/facelessuser/soupsieve/releases/tag/3.0"}], "affected": [{"vendor": "facelessuser", "product": "soupsieve", "versions": [{"version": "< 3.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-12T16:57:01.566Z"}, "descriptions": [{"lang": "en", "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 3.0, the CSS_ESCAPES and IDENTIFIER regular-expression subpatterns can backtrack exponentially on runs of ambiguous digit escapes in an attribute-name or tag position of an otherwise valid selector. The failure occurs during selector compilation through soupsieve.compile() or Beautiful Soup select() before SELECTOR_LIMIT is applied, so an application that accepts untrusted selector strings can have a worker stalled by a short input. This issue is fixed in version 3.0."}], "source": {"advisory": "GHSA-6655-6qjp-jx7x", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "soupsieve", "vendor": "facelessuser", "versions": [{"status": "affected", "version": "< 3.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 3.0, the CSS_ESCAPES and IDENTIFIER regular-expression subpatterns can backtrack exponentially on runs of ambiguous digit escapes in an attribute-name or tag position of an otherwise valid selector. The failure occurs during selector compilation through soupsieve.compile() or Beautiful Soup select() before SELECTOR_LIMIT is applied, so an application that accepts untrusted selector strings can have a worker stalled by a short input. This issue is fixed in version 3.0."}], "id": "CVE-2026-126191", "lastModified": "2026-11-12T19:09:06.967", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-12T17:17:32.627", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/facelessuser/soupsieve/commit/dbfa2854ff31a863326bd6660d4e55c6f068db9e"}, {"source": "security-advisories@github.com", "url": "https://github.com/facelessuser/soupsieve/pull/300"}, {"source": "security-advisories@github.com", "url": "https://github.com/facelessuser/soupsieve/releases/tag/3.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-6655-6qjp-jx7x"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,3.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "soupsieve", "source": "cna", "vendor": "facelessuser"}, "product": "soupsieve", "vendor": "facelessuser"}], "created": "2026-11-13T01:15:12.332408+00:00", "updated": "2026-11-13T01:15:12.332434+00:00", "vendors": ["facelessuser", "facelessuser$PRODUCT$soupsieve"]}