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CVE-2026-76875 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://doc.pypy.org/release-v8.0.0.html	[email protected]
https://github.com/pypy/pypy/releases/tag/release-pypy3.11-v8.0.0	[email protected]
https://github.com/pypy/pypy/releases/tag/release-pypy3.12-v8.0.0	[email protected]
https://www.vulncheck.com/advisories/pypy-pyexpat-externalentityparsercreate-use-after-free	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes