RHSA-2025:22871 — Security Advisory

An update for expat is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: internal entity expansion (CVE-2013-0340)

• expat: large number of colons in input makes parser consume high amount of resources, leading to DoS (CVE-2018-20843)

• expat: heap-based buffer over-read via crafted XML input (CVE-2019-15903)

• expat: Large number of prefixed XML attributes on a single tag can crash libexpat (CVE-2021-45960)

• expat: Integer overflow in doProlog in xmlparse.c (CVE-2021-46143)

• expat: Integer overflow in addBinding in xmlparse.c (CVE-2022-22822)

• expat: Integer overflow in build_model in xmlparse.c (CVE-2022-22823)

• expat: Integer overflow in defineAttribute in xmlparse.c (CVE-2022-22824)

• expat: Integer overflow in lookup in xmlparse.c (CVE-2022-22825)

• expat: Integer overflow in nextScaffoldPart in xmlparse.c (CVE-2022-22826)

• expat: Integer overflow in storeAtts in xmlparse.c (CVE-2022-22827)

• expat: integer overflow in the doProlog function (CVE-2022-23990)

• expat: Stack exhaustion in doctype parsing (CVE-2022-25313)

• expat: Integer overflow in copyString() (CVE-2022-25314)

• expat: use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate (CVE-2022-43680)

• expat: parsing large tokens can trigger a denial of service (CVE-2023-52425)

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.