CVE-2026-4224CWE-674

CVE-2026-4224

High · published March 16, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
52.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00702 · 52.7th percentile
Weakness
CWE-674 · Uncontrolled Recursion
Published
2026-03-16T22:16Z
Affected products (10)
ProductVersionsFixed in
python/python< 3.10.03.10.0
python/python≥ 3.13.0, < 3.13.133.13.13
python/python≥ 3.14.0, < 3.14.43.14.4
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
References (10)
https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a · [email protected]https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621 · [email protected]https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785 · [email protected]https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee · [email protected]https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3 · [email protected]https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768 · [email protected]https://github.com/python/cpython/issues/145986 · [email protected]https://github.com/python/cpython/pull/145987 · [email protected]https://mail.python.org/archives/list/[email protected]/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/ · [email protected]http://www.openwall.com/lists/oss-security/2026/03/16/4 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 16 MAR 17:52Z
    Stack overflow parsing XML with deeply nested DTD content models
    cvelistv5