{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-76875", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-19T21:47:08.936Z", "datePublished": "2026-09-29T12:45:19.797Z", "dateUpdated": "2026-09-29T12:45:19.797Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-29T12:45:19.797Z"}, "title": "PyPy pyexpat ExternalEntityParserCreate Use-After-Free", "descriptions": [{"lang": "en", "value": "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."}], "tags": ["x_open-source"], "datePublic": "2026-09-19T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-416", "description": "Use After Free", "type": "CWE"}]}], "affected": [{"defaultStatus": "unaffected", "vendor": "PyPy", "product": "PyPy", "packageURL": "pkg:github/pypy/pypy", "repo": "https://github.com/pypy/pypy", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThan": "3.11.16"}, {"status": "affected", "version": "3.12.0", "versionType": "semver", "lessThan": "3.12.14"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.3, "vectorString": "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}}], "references": [{"url": "https://doc.pypy.org/release-v8.0.0.html", "name": "Release Notes", "tags": ["release-notes"]}, {"url": "https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0", "name": "3.12 Release Tag", "tags": ["patch"]}, {"url": "https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0", "name": "3.11 Release Tag", "tags": ["patch"]}, {"url": "https://www.vulncheck.com/advisories/pypy-pyexpat-externalentityparsercreate-use-after-free", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "Fabian Wahle (Hap Security)", "type": "finder"}, {"lang": "en", "value": "VulnCheck", "type": "coordinator"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "vulncheck"}}}}

{}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,3.11.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.12.0,3.12.14)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "PyPy", "source": "cna", "vendor": "PyPy"}, "product": "pypy", "vendor": "pypy"}], "created": "2026-09-29T16:45:17.409923+00:00", "updated": "2026-09-29T17:15:08.740191+00:00", "vendors": ["pypy", "pypy$PRODUCT$pypy"]}