{"id":"CVE-2026-76875","title":"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…","summary":"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…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-416"],"vendor":"PyPy","product":"PyPy","affected":["PyPy < 3.11.16","PyPy >= 3.12.0 < 3.12.14"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T13:17:52.280","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76875","references":[{"url":"https://doc.pypy.org/release-v8.0.0.html","label":"disclosure@vulncheck.com"},{"url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/pypy-pyexpat-externalentityparsercreate-use-after-free","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-29T13:34:31.681Z","slug":"CVE-2026-76875","body":"## Overview\n\nPyPy 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}