CVE-2026-113351

Medium

Description

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.

SeverityMedium

CVSS5.9

Exploit probability—

ProductLibexpat

PublishedOct 20, 2026

First seenOct 20, 2026

Weakness typeCWE-909CWE-909

How to fix

Patches

github.com/libexpat/libexpat/pull/1431

Affected products

Product	Affected versions	Fixed in
libexpat_project libexpat	2.7.2 ≤ v ≤ 2.9.0	—

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