CVE-2026-4224 — Uncontrolled Recursion in Software Foundation Cpython

CWE-674 — Uncontrolled RecursionCWE-805 — Buffer Access with Incorrect Length Value13 documents9 sources
Severity
6.0MEDIUMNVD
EPSS
0.0%
top 91.52%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Python Software Foundation Cpython
Timeline
PublishedMar 16

Description

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected Packages1 packages

▶CVEListV5python_software_foundation/cpython3.14.0 — 3.14.4+2

🔴Vulnerability Details

3
GHSA
GHSA-h46w-ffvp-4pw5: When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack↗2026-03-16
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CVEList
Stack overflow parsing XML with deeply nested DTD content models↗2026-03-16
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OSV
CVE-2026-4224: When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack↗2026-03-16
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📋Vendor Advisories

3
Red Hat
cpython: Stack overflow parsing XML with deeply nested DTD content models↗2026-03-16
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Microsoft
Stack overflow parsing XML with deeply nested DTD content models↗2026-03-10
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Debian
CVE-2026-4224: pypy3 - When an Expat parser with a registered ElementDeclHandler parses an inline docum...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-4224 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

5
Bugzilla
CVE-2026-4224 python3.15: Stack overflow parsing XML with deeply nested DTD content models [fedora-all]↗2026-03-16
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Bugzilla
CVE-2026-4224 cpython: Stack overflow parsing XML with deeply nested DTD content models↗2026-03-16
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Bugzilla
CVE-2026-4224 python3.13: Stack overflow parsing XML with deeply nested DTD content models [fedora-all]↗2026-03-16
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Bugzilla
CVE-2026-4224 mingw-python3: Stack overflow parsing XML with deeply nested DTD content models [fedora-all]↗2026-03-16
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Bugzilla
CVE-2026-4224 python3.14: Stack overflow parsing XML with deeply nested DTD content models [fedora-all]↗2026-03-16
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CVE-2026-4224 — Uncontrolled Recursion | cvebase