{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-126191 in the wild and no public exploit code.","exposure":"An affected version is only exploitable if your software calls soupsieve.compile() or select(). Many projects that include it are not exposed.","fix":"No fix has been published for CVE-2026-126191 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-126191 is a high-severity denial of service vulnerability in facelessuser soupsieve, published on 12 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-126191 and fix it if it is affected.\n\nWhat it is: CVE-2026-126191 is a high-severity denial of service vulnerability in facelessuser soupsieve, published on 12 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-126191 in the wild and no public exploit code.\nExposure: An affected version is only exploitable if your software calls soupsieve.compile() or select(). Many projects that include it are not exposed.\n\nAffected product: facelessuser soupsieve. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n   If an affected version is present, also search the code for calls to soupsieve.compile() or select() and report whether any exist.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-126191/ (Markdown: https://insights.sbomify.com/CVE-2026-126191/index.md)","id":"CVE-2026-126191","markdown":"https://insights.sbomify.com/CVE-2026-126191/index.md","name":"CVE-2026-126191","record":{"aliases":["GHSA-6655-6qjp-jx7x"],"analysis":{"component_type":"library","exploitable_when_present":false,"fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python CSS selector library","requires_auth":"none","requires_specific_call":true,"summary":"Attackers supplying untrusted selector strings can trigger exponential regex backtracking in Soup Sieve, stalling workers of applications that compile untrusted selectors.","user_interaction":"not_required","vuln_class":"denial_of_service","vulnerable_functions":["soupsieve.compile()","select()"]},"analysis_generated_by":"sbomify/insights-2b-fp8","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-1333","name":"Inefficient Regular Expression Complexity"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Soup Sieve: Exponential ReDoS in selector compilation via \\9-run in CSS_ESCAPES/IDENTIFIER","id":"CVE-2026-126191","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Soup Sieve: General sibling combinator inside :has() matches untrusted HTML in quadratic time","id":"CVE-2026-126192"},"nickname":null,"packages":[],"prev":{"headline":"Soup Sieve: Polynomial-time denial of service in the descendant combinator","id":"CVE-2026-126190"},"products":["soupsieve"],"published":"2026-11-12","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-12","vendors":["facelessuser"]},"summary":"Attackers supplying untrusted selector strings can trigger exponential regex backtracking in Soup Sieve, stalling workers of applications that compile untrusted selectors.","url":"https://insights.sbomify.com/CVE-2026-126191/"}