Dashboard / CVE-2026-76875

CVE-2026-76875

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 73/100
Published: 2026-09-29 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: Present
VC: None
VI: Low
VA: None

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
PyPy PyPy 0 < 3.11.16
PyPy PyPy 3.12.0 < 3.12.14

References & Advisories (4)

Bug Bounty Relevance

73 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.3 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.24%
Raw Score 0.002400
Percentile 15.3%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00240
2026-11-12
0.00240
2026-11-10
0.00240
2026-11-09
0.00240
2026-11-08
0.00240

Intelligence Sources

mitre ref →

External Links