{"schema":"threatline.record/2","record":{"id":"CVE-2026-76875","aliases":[],"summary":"PyPy pyexpat ExternalEntityParserCreate Use-After-Free","details":"PyPy before versions 3.11.16 and 3.12.14 contains a use-after-free vulnerability in the pyexpat module's ExternalEntityParserCreate function that allows attackers to corrupt memory by supplying a crafted XML document to applications that create external-entity sub-parsers without retaining a reference to the parent parser. The child parser retains a raw C back-pointer to the parent parser struct while PyPy's tracing garbage collector can free the parent's C struct, causing bundled libexpat to dereference the freed pointer on every parsed token, producing memory corruption.","categories":["Unclassified"],"product":"PyPy","vendor":"PyPy","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-76875","source_modified_at":"2026-10-02T12:07:30.652Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"PyPy","vendor":"PyPy","versions":[{"status":"affected","version":"0","versionType":"semver","lessThan":"3.11.16"},{"status":"affected","version":"3.12.0","versionType":"semver","lessThan":"3.12.14"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-76875","source_modified_at":"2026-10-02T12:07:30.652Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"PyPy","ecosystem":null},"version":"3.11.16","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-76875","source_modified_at":"2026-10-02T12:07:30.652Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"PyPy","ecosystem":null},"version":"3.12.14","basis":"first unaffected version stated in the CVE record"}],"cvss":6.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.0024,"percentile":0.14302,"score_date":"2026-10-23"},"published_at":"2026-09-29T12:45:19.797Z","modified_at":"2026-10-02T12:07:30.652Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-76875","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-02T12:07:30.652Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76875","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://doc.pypy.org/release-v8.0.0.html","tags":["release-notes"]},{"source":"CVE List","url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0","tags":["patch"]},{"source":"CVE List","url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/pypy-pyexpat-externalentityparsercreate-use-after-free","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-02T12:07:14.237053Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-02T12:07:30.652Z","content_hash":"c99369582d04d981407526aa1c6b3f9088286a3dff1e100416ed0e04afc681a2"}}