Stack overflow parsing XML with deeply nested DTD content models
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-4224US | high7.5 | — | ||
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. | ||||
02
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/03/16/4ADVISORY
- https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4aFIX
- https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621WEB
- https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785FIX
- https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914feeFIX
- https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3FIX
- https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768FIX
- https://github.com/python/cpython/issues/145986REPORT
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