RHSA-2025:21776HighCVSS 7.5

Red Hat Security Advisory: expat security update

Published
November 19, 2025
Last Modified
September 1, 2026

🔗 CVE IDs covered (4)

CVE-2013-0340 →CVE-2022-23990 →CVE-2024-28757 →CVE-2025-59375 →

📋 Description

CVE-2013-0340 — expat: internal entity expansion CVE-2022-23990 — expat: integer overflow in the doProlog function CVE-2024-28757 — expat: XML Entity Expansion 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 products22

  • Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-0:2.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-0:2.5.0-1.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-0:2.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-0:2.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-0:2.5.0-1.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-0:2.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debuginfo-0:2.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debuginfo-0:2.5.0-1.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debuginfo-0:2.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debuginfo-0:2.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debuginfo-0:2.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debugsource-0:2.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debugsource-0:2.5.0-1.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debugsource-0:2.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debugsource-0:2.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-debugsource-0:2.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-devel-0:2.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-devel-0:2.5.0-1.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-devel-0:2.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-devel-0:2.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • expat-devel-0:2.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (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)