Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inlinedocument type definition containing a deeply nested content model a C stackoverflow occurs.
Back to all
CVE

CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inlinedocument type definition containing a deeply nested content model a C stackoverflow occurs.

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.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
6
-
4.0
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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768, https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/, https://github.com/python/cpython/issues/145986, https://github.com/python/cpython/pull/145987, https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a, https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3, https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785, https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.0005%
EPSS Percentile
0.15848%
Introduced Version
0
Fix Available
af856a7177326ac25d9f66cc6dd28b554d914fee

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading