CVE-2026-4224

N/A Unknown

Published: March 16, 2026 Modified: March 17, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a

Source: cna@python.org

https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3

Source: cna@python.org

https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768

Source: cna@python.org

https://github.com/python/cpython/issues/145986

Source: cna@python.org

https://github.com/python/cpython/pull/145987

Source: cna@python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/

Source: cna@python.org

http://www.openwall.com/lists/oss-security/2026/03/16/4

Source: af854a3a-2127-422b-91ae-364da2661108

7 reference(s) from NVD

Quick Stats

CVSS v3 Score

N/A / 10.0

EPSS (Exploit Probability)

0.0%

4th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-674

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