Moole Vulnerability Database

Find real vulnerabilities before they ship

Medium

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 overflow occurs.

VectorNETWORK

PublishedMar 16, 2026, 18:16

Published Bycna@python.org

Base Score

Score6

Affected Versions

No affected versions found.

References

https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a
https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785
https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee
https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3
https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768
https://github.com/python/cpython/issues/145986
https://github.com/python/cpython/pull/145987
https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/
http://www.openwall.com/lists/oss-security/2026/03/16/4

Weakness Type

CWE-674

CVSS Metrics

Base Score

Vector String

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Base SeverityMedium

Version

4.0

Attack Vector (AV)

NETWORK