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CVE-2026-76875— PyPy pyexpat ExternalEntityParserCreate Use-After-Free

Quick assessment

Affected
PyPy PyPy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-76875

Vulnerability Information

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Vulnerability Title
PyPy pyexpat ExternalEntityParserCreate Use-After-Free
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PyPy PyPy 0 ~ 3.11.16 -

II. Public POCs for CVE-2026-76875

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III. Intelligence Information for CVE-2026-76875

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Other References for CVE-2026-76875 (4)

IV. Related Vulnerabilities

Same weakness: CWE-416

V. Comments for CVE-2026-76875

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