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TI-2026-03671 Aliases CVE-2026-4224GHSA-h46w-ffvp-4pw5

Stack overflow parsing XML with deeply nested DTD content models

Priority LOW 28CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 9 fixed, 6 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-674.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00717 54th percentileScored 2026-11-07
Fix Partial CPython (Python Software Foundation): 3.10.21, 3.11.16, 3.12.14 +3Red Hat: 11 advisoriesRed Hat: 9 fixed, 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Python Software FoundationCPythonbefore 3.10.21; 3.11.0 to before 3.11.16; 3.12.0 to before 3.12.14; 3.13.0 to before 3.13.13; 3.14.0 to before 3.14.4; 3.15.0a1 to before 3.15.0a83.10.21, 3.11.16, 3.12.14, 3.13.13, 3.14.4, 3.15.0a8Patch availableCNA
  • CPython VendorPython Software Foundation Affected before 3.10.21; 3.11.0 to before 3.11.16; 3.12.0 to before 3.12.14; 3.13.0 to before 3.13.13; 3.14.0 to before 3.14.4; 3.15.0a1 to before 3.15.0a8 Fixed in 3.10.21, 3.11.16, 3.12.14, 3.13.13, 3.14.4, 3.15.0a8 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*before 3.10.0; 3.13.0 to before 3.13.13; 3.14.0 to before 3.14.4Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*3.15.0 alpha1Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*3.15.0 alpha2Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*3.15.0 alpha3Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*3.15.0 alpha4Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*3.15.0 alpha5Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*3.15.0 alpha6Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*3.15.0 alpha7Vulnerablepython-pillow
  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions before 3.10.0; 3.13.0 to before 3.13.13; 3.14.0 to before 3.14.4 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:* Versions 3.15.0 alpha1 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:* Versions 3.15.0 alpha2 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:* Versions 3.15.0 alpha3 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:* Versions 3.15.0 alpha4 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:* Versions 3.15.0 alpha5 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:* Versions 3.15.0 alpha6 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:* Versions 3.15.0 alpha7 Vulnerable ·python-pillow

Remediation

  • Fix · CNA CPython (Python Software Foundation) Fixed in 3.10.21, 3.11.16, 3.12.14, 3.13.13, 3.14.4, 3.15.0a8

Red Hat 11 advisories

  • RHSA-2026:58981 Released 2026-08-24 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.3 Technology Preview security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
  • RHSA-2026:21275 Released 2026-05-27 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.1 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:19176 Released 2026-05-19 · Red Hat rating Important
    python3.14 security update
    • Red Hat Enterprise Linux AppStream (v. 9) python3.14-3.14.4-2.el9_8, python3.14-devel-3.14.4-2.el9_8, python3.14-libs-3.14.4-2.el9_8 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3.14-3.14.4-2.el9_8, python3.14-debug-3.14.4-2.el9_8, python3.14-freethreading-3.14.4-2.el9_8 +9
Show 8 more Red Hat advisories
  • RHSA-2026:19177 Released 2026-05-19 · Red Hat rating Important
    python3.12 security update
    • Red Hat Enterprise Linux AppStream (v. 9) python3.12-3.12.13-2.el9_8, python3.12-devel-3.12.13-2.el9_8, python3.12-libs-3.12.13-2.el9_8 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3.12-3.12.13-2.el9_8, python3.12-debug-3.12.13-2.el9_8, python3.12-idle-3.12.13-2.el9_8 +2
  • RHSA-2026:19064 Released 2026-05-19 · Red Hat rating Important
    python3.12 security update
    • Red Hat Enterprise Linux AppStream (v. 10) python-unversioned-command-3.12.13-2.el10_2, python3-devel-3.12.13-2.el10_2, python3-tkinter-3.12.13-2.el10_2
    • Red Hat Enterprise Linux BaseOS (v. 10) python3-3.12.13-2.el10_2, python3-libs-3.12.13-2.el10_2, python3.12-3.12.13-2.el10_2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) python3-debug-3.12.13-2.el10_2, python3-idle-3.12.13-2.el10_2, python3-test-3.12.13-2.el10_2
  • RHSA-2026:19019 Released 2026-05-19 · Red Hat rating Important
    python3.14 security update
    • Red Hat Enterprise Linux AppStream (v. 10) python3.14-3.14.4-2.el10_2, python3.14-devel-3.14.4-2.el10_2, python3.14-libs-3.14.4-2.el10_2 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) python3.14-debug-3.14.4-2.el10_2, python3.14-freethreading-3.14.4-2.el10_2, python3.14-freethreading-debug-3.14.4-2.el10_2 +7
  • RHSA-2026:10950 Released 2026-04-27 · Red Hat rating Important
    python3.12 security update
    • Red Hat Enterprise Linux AppStream (v. 8) python3.12-3.12.13-2.el8_10, python3.12-devel-3.12.13-2.el8_10, python3.12-libs-3.12.13-2.el8_10 +2
    • Red Hat Enterprise Linux CRB (v. 8) python3.12-3.12.13-2.el8_10, python3.12-debug-3.12.13-2.el8_10, python3.12-idle-3.12.13-2.el8_10 +2
  • RHSA-2026:8824 Released 2026-04-17 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3.12-3.12.13-3.hum1@aarch64, python3.12-3.12.13-3.hum1@src, python3.12-3.12.13-3.hum1@x86_64 +12
  • RHSA-2026:8822 Released 2026-04-17 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3.11-3.11.15-4.hum1@aarch64, python3.11-3.11.15-4.hum1@src, python3.11-3.11.15-4.hum1@x86_64 +12
  • RHSA-2026:7661 Released 2026-04-11 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python-unversioned-command-3.14.4-1.hum1@noarch@public-hummingbird-aarch64-rpms, python-unversioned-command-3.14.4-1.hum1@noarch@public-hummingbird-x86_64-rpms, python3-3.14.4-1.hum1@aarch64 +28
  • RHSA-2026:7443 Released 2026-04-10 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3.13-3.13.13-1.hum1@aarch64, python3.13-3.13.13-1.hum1@src, python3.13-3.13.13-1.hum1@x86_64 +16

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Python Software Foundation CPython 3.10.21, 3.11.16 and 4 more versions

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-03144 Incomplete control character validation in http.cookiesPriority LOW 27
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)Affected—
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:19019, RHSA-2026:19064
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:10950
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:19176, RHSA-2026:19177
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:19064
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:10950
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:19019, RHSA-2026:19064
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:19176, RHSA-2026:19177
Red Hat Hardened ImagesFixed RHSA-2026:7443, RHSA-2026:7661, RHSA-2026:8822, RHSA-2026:8824
Red Hat Update Infrastructure 5Fixed RHSA-2026:21275, RHSA-2026:58981
Not affected: 1 product
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4224
  2. 2026-10-03 Alias added: GHSA-h46w-ffvp-4pw5
  3. 2026-11-06 Affected versions changed · Red Hat

References

Patch 7

Advisory 2

Other 1

  • TI-2024-07037 Quadratic complexity parsing cookies with backslashes CVSS 3.1HIGH 7.5
  • TI-2024-11791 Bypass extraction filter to modify file metadata outside extraction directory CVSS 3.1MEDIUM 5.3
  • TI-2024-00411 Quoted zip-bomb protection for zipfile CVSS 3.1MEDIUM 6.2
  • TI-2026-13296 `HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching CVSS 4.0MEDIUM 6.0
  • TI-2024-06422 Email header injection due to unquoted newlines CVSS 3.1MEDIUM 5.5
  • TI-2026-04606 Possible to hijack modules in current working directory CVSS 4.0MEDIUM 5.6
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences