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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Python Software Foundation | CPython | < 3.10.21; >= 3.11.0, < 3.11.16; >= 3.12.0, < 3.12.14; >= 3.13.0, < 3.13.13; >= 3.14.0, < 3.14.4; >= 3.15.0a1, < 3.15.0a8 |
References
- https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4aPatch
- https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621
- https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785Patch
- https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914feePatch
- https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3Patch
- https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768Patch
- https://github.com/python/cpython/issues/145986Issue Tracking
- https://github.com/python/cpython/pull/145987Patch
- https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/16/4Mailing List, Third Party Advisory
Timeline
- Published
- Mar 16, 2026
- Last modified
- Aug 13, 2026
- NVD status
- Modified