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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Python Software Foundation CPython
Default version status: unaffected
0 to < 3.10.21affected3.11.0 to < 3.11.16affected3.12.0 to < 3.12.14affected3.13.0 to < 3.13.13affected3.14.0 to < 3.14.4affected3.15.0a1 to < 3.15.0a8affected
References
- https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768 ↗
- https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/ ↗
- https://github.com/python/cpython/issues/145986 ↗
- https://github.com/python/cpython/pull/145987 ↗
- https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a ↗
- https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3 ↗
- https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785 ↗
- https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee ↗
- https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621 ↗
- http://www.openwall.com/lists/oss-security/2026/03/16/4 ↗