CVE-2026-4224

MEDIUM EPSS 45.3%
Published Mar 16, 20263mo ago · Modified Jun 17, 20261w ago
6.0 CVSS 4.0
Medium
Find Similar
Published Mar 16, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
6.0
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
45.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-674

Affected Products 10

VendorProductVersionRange
pythonpython* <3.10.0
pythonpython*≥3.13.0  –  <3.13.13
pythonpython*≥3.14.0  –  <3.14.4
pythonpython3.15.0any
pythonpython3.15.0any
pythonpython3.15.0any
pythonpython3.15.0any
pythonpython3.15.0any
pythonpython3.15.0any
pythonpython3.15.0any

References 9

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/16/4
    Mailing ListThird Party Advisory
  • github.com https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a
    Patch
  • github.com https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785
    Patch
  • github.com https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee
    Patch
  • github.com https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3
    Patch
  • github.com https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768
    Patch
  • github.com https://github.com/python/cpython/issues/145986
    Issue Tracking
  • github.com https://github.com/python/cpython/pull/145987
    Patch
  • mail.python.org https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/
    Third Party Advisory

Remediation

  • github.com https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a
    Patch
  • github.com https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785
    Patch
  • github.com https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee
    Patch
  • github.com https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3
    Patch
  • github.com https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768
    Patch
  • github.com https://github.com/python/cpython/pull/145987
    Patch