Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4
- https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe78
- https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fe
- https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f
- https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf53276
- https://github.com/python/cpython/issues/145986
- https://github.com/python/cpython/pull/145987
- https://mail.python.org/archives/list/[email protected]/thread/5M7CGU
- http://www.openwall.com/lists/oss-security/2026/03/16/4
FAQ
What is CVE-2026-4224?
CVE-2026-4224 is a documented vulnerability. 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.
How severe is CVE-2026-4224?
CVSS scoring is not yet available for CVE-2026-4224. Check NVD for updates.
Is there a patch for CVE-2026-4224?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.