{"id":"CVE-2026-76875","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-76875","generatedAt":"2026-10-28T03:58:12.225Z","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 create…","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.","published":"2026-09-29T13:17:52.000Z","lastModified":"2026-10-02T13:17:56.000Z","status":"Awaiting Analysis","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-416"],"affected":[],"epss":{"score":0.0024,"percentile":0.15048,"date":"2026-10-27","history":[{"date":"2026-09-30","score":0.0024,"percentile":0.13665}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T13:17:52.000Z","detail":{"score":"6.3","severity":"MEDIUM","publishedAt":"2026-09-29T13:17:52.280Z"},"summary":"New CVE, medium severity (CVSS 6.3)."}],"references":[{"url":"https://doc.pypy.org/release-v8.0.0.html","source":"disclosure@vulncheck.com"},{"url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0","source":"disclosure@vulncheck.com"},{"url":"https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/pypy-pyexpat-externalentityparsercreate-use-after-free","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-76875","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}