Medium5.3Red Hat Linux

Medium [CVE-2026-34480] Invalid XML output causes denial of service in logging

This medium-severity Red Hat Linux advisory covers CVE-2026-34480 affecting log4j-core-test, offline-knowledge-portal/rhokp-rhel9:1779996999, Red Hat Enterprise Linux.

CVE-2026-34480 Published Apr 10, 2026

CVE-2026-34480

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Invalid XML output causes denial of service in logging. Red Hat rates this moderate (CVSS 5.3).

Weakness: CWE-168. Affected package(s): log4j-core-test, offline-knowledge-portal/rhokp-rhel9:1779996999, log4j-core.

Resolved in Red Hat advisory RHSA-2026:22619 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux.

Affected versions

log4j-core-test
offline-knowledge-portal/rhokp-rhel9:1779996999
log4j-core

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:22619

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:22619 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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