RHSA-2026:3407HighCVSS 5.3

Red Hat Security Advisory: mingw-fontconfig security update

Published
February 26, 2026
Last Modified
September 1, 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 products6

  • Red Hat Enterprise Linux CRB (v. 8)
  • mingw-fontconfig-0:2.12.6-4.el8_10.src as a component of Red Hat Enterprise Linux CRB (v. 8)
  • mingw32-fontconfig-0:2.12.6-4.el8_10.noarch as a component of Red Hat Enterprise Linux CRB (v. 8)
  • mingw32-fontconfig-debuginfo-0:2.12.6-4.el8_10.noarch as a component of Red Hat Enterprise Linux CRB (v. 8)
  • mingw64-fontconfig-0:2.12.6-4.el8_10.noarch as a component of Red Hat Enterprise Linux CRB (v. 8)
  • mingw64-fontconfig-debuginfo-0:2.12.6-4.el8_10.noarch as a component of Red Hat Enterprise Linux CRB (v. 8)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 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)