RHSA-2025:22871HighCVSS 9.8

Red Hat Security Advisory: expat security update

Published
December 9, 2025
Last Modified
August 6, 2026

🔗 CVE IDs covered (18)

CVE-2018-20843 →CVE-2022-22823 →CVE-2023-52425 →CVE-2019-15903 →CVE-2022-22822 →CVE-2022-22824 →CVE-2022-22826 →CVE-2022-22827 →CVE-2022-23990 →CVE-2022-43680 →CVE-2024-8176 →CVE-2021-46143 →CVE-2022-25314 →CVE-2021-45960 →CVE-2022-22825 →CVE-2022-25313 →CVE-2025-59375 →CVE-2013-0340 →

📋 Description

CVE-2013-0340 — expat: internal entity expansion CVE-2018-20843 — expat: large number of colons in input makes parser consume high amount of resources, leading to DoS CVE-2019-15903 — expat: heap-based buffer over-read via crafted XML input CVE-2021-45960 — expat: Large number of prefixed XML attributes on a single tag can crash libexpat CVE-2021-46143 — expat: Integer overflow in doProlog in xmlparse.c CVE-2022-22822 — expat: Integer overflow in addBinding in xmlparse.c CVE-2022-22823 — expat: Integer overflow in build_model in xmlparse.c CVE-2022-22824 — expat: Integer overflow in defineAttribute in xmlparse.c CVE-2022-22825 — expat: Integer overflow in lookup in xmlparse.c CVE-2022-22826 — expat: Integer overflow in nextScaffoldPart in xmlparse.c CVE-2022-22827 — expat: Integer overflow in storeAtts in xmlparse.c CVE-2022-23990 — expat: integer overflow in the doProlog function CVE-2022-25313 — expat: Stack exhaustion in doctype parsing CVE-2022-25314 — expat: Integer overflow in copyString() CVE-2022-43680 — expat: use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate CVE-2023-52425 — expat: parsing large tokens can trigger a denial of service CVE-2024-8176 — libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat 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 products10

  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-0:2.2.10-1.el8_2.i686 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-0:2.2.10-1.el8_2.src as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-0:2.2.10-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-debuginfo-0:2.2.10-1.el8_2.i686 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-debuginfo-0:2.2.10-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-debugsource-0:2.2.10-1.el8_2.i686 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-debugsource-0:2.2.10-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-devel-0:2.2.10-1.el8_2.i686 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
  • expat-devel-0:2.2.10-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v. 8.2)

✅ 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: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. 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 (21)