{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"pypy/pypy","product":"PyPy","source":"CNA: VulnCheck","vendor":"PyPy","versions":[{"lessThan":"3.11.16","status":"affected","version":"0","versionType":"semver"},{"lessThan":"3.12.14","status":"affected","version":"3.12.0","versionType":"semver"}]}],"cveId":"CVE-2026-76875","cwes":["CWE-416"],"description":"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.","epss":{"date":"2026-11-08","percentile":0.15205,"score":0.0024},"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1794146933277,"publishedAt":1790685919797,"references":[{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://doc.pypy.org/release-v8.0.0.html"},{"source":"CNA: VulnCheck","tags":["patch","release-notes"],"url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0"},{"source":"CNA: VulnCheck","tags":["patch","release-notes"],"url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/pypy-pyexpat-externalentityparsercreate-use-after-free"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0"}],"revision":"ce749b00722d9515c74e6145ee3df3629a33d35e1c5280dd87532e127e56aeab","sources":[{"modifiedAt":1794146933277,"name":"CNA: VulnCheck","retrievedAt":1794151356544,"url":"https://www.cve.org/CVERecord?id=CVE-2026-76875"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794151367855,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76875"}],"ssvc":{"assessedAt":1790942834237,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"PyPy pyexpat ExternalEntityParserCreate Use-After-Free","updatedAt":1794151367855}