CVE-2026-4224

6.0 mediumEPSS 0.7%

Medium (6.0) in python python. EPSS 0.7% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

6.0 medium

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

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-31)
CWE: CWE-674
Published: 2026-03-16
Modified: 2026-08-13
Record from: the NVD, synced 2026-10-19

Affected

python:python

References

https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a
https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621
https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785
https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee
https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3

Check your stack JSON