RHSA-2026:5396HighCVSS 5.3

Red Hat Security Advisory: Red Hat Hardened Images RPM Release

Published
March 23, 2026
Last Modified
October 9, 2026

🔗 CVE IDs covered (1)

CVE-2025-59375 →

📋 Description

CVE-2025-59375 — firefox: thunderbird: expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing

🎯 Affected products8

  • Red Hat Hardened Images
  • expat-0:2.7.5-1.hum1@aarch64 as a component of Red Hat Hardened Images
  • expat-0:2.7.5-1.hum1@src as a component of Red Hat Hardened Images
  • expat-0:2.7.5-1.hum1@x86_64 as a component of Red Hat Hardened Images
  • expat-devel-0:2.7.5-1.hum1@aarch64 as a component of Red Hat Hardened Images
  • expat-devel-0:2.7.5-1.hum1@x86_64 as a component of Red Hat Hardened Images
  • expat-static-0:2.7.5-1.hum1@aarch64 as a component of Red Hat Hardened Images
  • expat-static-0:2.7.5-1.hum1@x86_64 as a component of Red Hat Hardened Images

✅ Remediation

Red Hat Hardened Images RPM Release Workaround: To mitigate the issue, limit XML input size and complexity before parsing, and avoid accepting compressed or deeply nested XML. Use OS-level resource controls (like ulimit or setrlimit()) to cap memory usage, or run the parser in a sandboxed or isolated process with strict memory and CPU limits. This helps prevent denial-of-service by containing excessive resource consumption.

🔗 References (4)