RHSA-2026:5396HighCVSS 5.3
Red Hat Security Advisory: Red Hat Hardened Images RPM Release
🔗 CVE IDs covered (1)
📋 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 products4
- Red Hat Hardened Images
- expat-main@aarch64 as a component of Red Hat Hardened Images
- expat-main@src as a component of Red Hat Hardened Images
- expat-main@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.