{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86000", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-04T19:17:36.246Z", "datePublished": "2026-09-17T15:21:57.724Z", "dateUpdated": "2026-09-17T15:45:49.251Z"}, "containers": {"cna": {"title": "Soup Sieve: Polynomial-time ReDoS (O(n\u00b2)) in the `IDENTIFIER` / `VALUE` selector sub-patterns", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1333", "lang": "en", "description": "CWE-1333: Inefficient Regular Expression Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}}], "references": [{"name": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-gjv8-xp57-g29c", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-gjv8-xp57-g29c"}, {"name": "https://github.com/facelessuser/soupsieve/commit/ce44e4996e6632871c18cdd7a7fb641be8ef34ef", "tags": ["x_refsource_MISC"], "url": "https://github.com/facelessuser/soupsieve/commit/ce44e4996e6632871c18cdd7a7fb641be8ef34ef"}, {"name": "https://github.com/facelessuser/soupsieve/releases/tag/2.9", "tags": ["x_refsource_MISC"], "url": "https://github.com/facelessuser/soupsieve/releases/tag/2.9"}], "affected": [{"vendor": "facelessuser", "product": "soupsieve", "versions": [{"version": "< 2.9", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-17T15:21:57.724Z"}, "descriptions": [{"lang": "en", "value": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.9, the selector parser in src/soupsieve/css_parser.py defines IDENTIFIER with adjacent quantified groups over overlapping character classes, and VALUE embeds IDENTIFIER for attribute selectors. When an attacker-controlled selector contains a long identifier or unquoted attribute-value run followed by input that makes the overall match fail, the regular expression engine explores quadratically many splits between the overlapping groups. User-controlled selectors can reach this path through soupsieve.compile(), soupsieve.select(), or BeautifulSoup.select(), while applications using only hard-coded selectors are unaffected. The resulting CPU consumption can hold the Python GIL, exhaust application workers, and stall a service; successful plain identifier matches are linear, and the issue does not cause memory corruption or code execution. The issue is fixed in version 2.9."}], "source": {"advisory": "GHSA-gjv8-xp57-g29c", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-gjv8-xp57-g29c", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-17T15:45:31.018009Z", "id": "CVE-2026-86000", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-17T15:45:49.251Z"}}]}}

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