RHSA-2026:98582: Important: expat security update
Expat is a C library for parsing XML documents.Security Fix(es): expat: Expat: Denial of Service via quadratic complexity in attribute processing (CVE-2026-66046) expat: Expat: XML Injection via Malformed UTF-16 Input (CVE-2026-93990) expat: expat: Denial of Service via integer overflow in expatrealloc (CVE-2026-102633) expat: expat: Information disclosure via heap buffer over-read in XMLParseBuffer (CVE-2026-77214) 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/expatto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4 - Upgrade
Upgrade
redhat/expat-debuginfoto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4 - Upgrade
Upgrade
redhat/expat-debugsourceto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4 - Upgrade
Upgrade
redhat/expat-develto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4 - Upgrade
Upgrade
redhat/expatto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4.aa - Upgrade
Upgrade
redhat/expat-debuginfoto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4.aa - Upgrade
Upgrade
redhat/expat-debugsourceto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4.aa - Upgrade
Upgrade
redhat/expat-develto a version that resolves this vulnerability.Fixed in 2.7.3-2.el10_3.4.aa
Event History
Frequently Asked Questions
Which deployments should be reviewed for exposure?
Review systems and applications that use Expat to parse XML documents. The update covers the expat package and its expat-debuginfo, expat-debugsource, and expat-devel companion packages.
What kinds of XML input are implicated by the reported issues?
The listed issues involve attribute processing with quadratic complexity, malformed UTF-16 input, integer overflow in expat_realloc, and a heap buffer over-read in XML_ParseBuffer. Applications that process untrusted XML, particularly through these parsing paths, are the most relevant to assess.