Summary
Expat is a C library for parsing XML documents.
Security Fix(es):
* expat: expat: Denial of Service via integer overflow in expat_realloc (CVE-2026-102633)
* expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer (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.
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | expat | 2.5.0-6.el8_10 |
| AlmaLinux · 8 | expat-devel | 2.5.0-6.el8_10 |
Vulnerabilities 2
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High 8.2
libexpat Heap Buffer Over-read in xmlparse.c via XML_ParseBuffer
libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, …
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Medium 5.9
libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap …