Medium [CVE-2026-4224] Stack overflow parsing XML with deeply nested DTD content models
This medium-severity Red Hat Linux advisory covers CVE-2026-4224 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 1, Red Hat Enterprise Linux 8.
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Summary
Stack overflow parsing XML with deeply nested DTD content models. Red Hat rates this moderate (CVSS 5.9).
Weakness: CWE-805. Affected package(s): python3.12, python3, python3.14, rhui5/rhua-rhel9:1779798222, rhui5/installer-rhel9:1779798165.
Resolved in Red Hat advisory RHSA-2026:19019 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 8.
- python3.12-0:3.12.13-2.el9_8
- python3-12-main-3.12.13-3.hum1
- python3-14-main-3.14.4-1.hum1
- python3.12-0:3.12.13-2.el10_2
- python3.12-0:3.12.13-2.el8_10
- python3.14-0:3.14.4-2.el9_8
- python3.14-0:3.14.4-2.el10_2
- python3-13-main-3.13.13-1.hum1
- python3-11-main-3.11.15-4.hum1
- rhui5/rhua-rhel9:1779798222
- rhui5/installer-rhel9:1779798165
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:19019
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:19019 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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