CVE-2026-113351
libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.
| CWE | CWE-909 |
| Vendor | libexpat |
| Product | libexpat |
| Published | Oct 20, 2026 |
| Last Updated | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
libexpat / libexpat
2.7.2 ≤ 2.9.0
References
github.com: https://github.com/libexpat/libexpat/pull/1431 github.com: https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L860-L884 github.com: https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L1560 github.com: https://github.com/libexpat/libexpat vulncheck.com: https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.9.0-denial-of-service-via-xml-parserreset
Credits
Pu Cheng