CVE-2026-4224

Published: Mar 16, 2026Modified: Jun 17, 2026

6.0

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/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

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:XShow less

Source: CNA (Secondary)

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.

Affected (10)

Products: Python: Python

Python

1 product

Python

Configuration A

10 vulnerable

Vulnerable Software	Affected Versions
Python Python	Before 3.10.0
Python Python	From 3.13.0 to 3.13.13
Python Python	From 3.14.0 to 3.14.4
Python Python	Version 3.15.0 alpha1
Python Python	Version 3.15.0 alpha2
Python Python	Version 3.15.0 alpha3
Python Python	Version 3.15.0 alpha4
Python Python	Version 3.15.0 alpha5
Python Python	Version 3.15.0 alpha6
Python Python	Version 3.15.0 alpha7