Stack overflow parsing XML with deeply nested DTD content models
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6epss 0.7%
exploitation probability
0.7%top 49% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
Python Software Foundation · CPythonReferences
https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4ahttps://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914feehttps://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768https://github.com/python/cpython/issues/145986https://github.com/python/cpython/pull/145987https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/http://www.openwall.com/lists/oss-security/2026/03/16/4