{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-126189 in the wild and no public exploit code.","exposure":"An affected version is only exploitable if your software calls :has(), select() or select_one(). Many projects that include it are not exposed.","fix":"No fix has been published for CVE-2026-126189 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-126189 is a medium-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-2026-126189 and fix it if it is affected.\n\nWhat it is: CVE-2026-126189 is a medium-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-2026-126189 in the wild and no public exploit code.\nExposure: An affected version is only exploitable if your software calls :has(), select() or select_one(). 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 :has(), select() or select_one() 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-2026-126189/ (Markdown: https://insights.sbomify.com/CVE-2026-126189/index.md)","id":"CVE-2026-126189","markdown":"https://insights.sbomify.com/CVE-2026-126189/index.md","name":"CVE-2026-126189","record":{"aliases":["GHSA-8jvp-3x96-xpqw"],"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":"Attacker-influenced HTML or XML can trigger quadratic matching in :has() selectors, exhausting workers in apps using Soup Sieve on untrusted documents.","user_interaction":"not_required","vuln_class":"denial_of_service","vulnerable_functions":[":has()","select()","select_one()"]},"analysis_generated_by":"sbomify/insights-2b-fp8","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 4.0.1, Soup Sieve repeatedly searches descendant subtrees for each candidate evaluated by :has() and repeatedly reevaluates a parent containing :has(\u003e ...) for each child, causing quadratic matching on deeply nested or wide attacker-influenced HTML or XML. Applications using ordinary fixed selectors through select(), select_one(), or Beautiful Soup CSS APIs against untrusted documents can have a worker occupied for seconds or minutes, while applications that process only trusted documents are not affected. Selectors compiled with NOCACHE continue to use the old uncached behavior. This issue is fixed in version 4.0.1.","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: Quadratic-time denial of service when matching `:has()`","id":"CVE-2026-126189","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"Soup Sieve: Polynomial-time denial of service in the descendant combinator","id":"CVE-2026-126190"},"nickname":null,"packages":[],"prev":{"headline":"Active Storage: Possible local file disclosure in Active Storage video previews and analysis","id":"CVE-2026-126188"},"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":"Attacker-influenced HTML or XML can trigger quadratic matching in :has() selectors, exhausting workers in apps using Soup Sieve on untrusted documents.","url":"https://insights.sbomify.com/CVE-2026-126189/"}