Use After Free Affecting pypy3 package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.24% (14th percentile)

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  • Snyk IDSNYK-ECHOLATEST-PYPY3-20335186
  • published30 Sept 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

NewCVE-2026-76875  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest pypy3.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pypy3 package and not the pypy3 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1