-------- Forwarded Message -------- Subject: [Security-announce][CVE-2026-4224] Stack overflow parsing XML with deeply nested DTD content models Date: Mon, 16 Mar 2026 17:46:00 +0000 From: Stan Ulbrych via Security-announce <[email protected]> Reply-To: [email protected] To: [email protected] CC: Stan Ulbrych <[email protected]> There is a HIGH severity vulnerability affecting CPython. 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. Please see the linked CVE ID for the latest information on affected versions: * https://www.cve.org/CVERecord?id=CVE-2026-4224 * https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768
