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Vulnerability · Published Oct 20, 2026 · Assigned by VulnCheck

CVE-2026-113351libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset

Medium 5.9

In plain English

A medium-severity security flaw in libexpat from libexpat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.5%top 57.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21expat2.10.0-r0ALPINE-CVE-2026-113351
Alpine:v3.22expat2.10.0-r0ALPINE-CVE-2026-113351
Alpine:v3.23expat2.10.0-r0ALPINE-CVE-2026-113351
Alpine:v3.24expat2.10.0-r0ALPINE-CVE-2026-113351
Debian:12expatno fix listedDEBIAN-CVE-2026-113351
Debian:13expatno fix listedDEBIAN-CVE-2026-113351
Debian:14expatno fix listedDEBIAN-CVE-2026-113351
Ubuntu:22.04:LTScadaverno fix listedUBUNTU-CVE-2026-113351
Ubuntu:24.04:LTScadaverno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.04:LTScadaverno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10cadaverno fix listedUBUNTU-CVE-2026-113351
Ubuntu:22.04:LTSexpatno fix listedUBUNTU-CVE-2026-113351
Ubuntu:24.04:LTSexpatno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.04:LTSexpatno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10expatno fix listedUBUNTU-CVE-2026-113351
Ubuntu:22.04:LTSinsighttoolkit4no fix listedUBUNTU-CVE-2026-113351
Ubuntu:22.04:LTSmatanzano fix listedUBUNTU-CVE-2026-113351
Ubuntu:24.04:LTSmatanzano fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.04:LTSmatanzano fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10matanzano fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10swish-eno fix listedUBUNTU-CVE-2026-113351
Ubuntu:22.04:LTStdomno fix listedUBUNTU-CVE-2026-113351
Ubuntu:24.04:LTStdomno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.04:LTStdomno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10tdomno fix listedUBUNTU-CVE-2026-113351
Ubuntu:22.04:LTSwbxml2no fix listedUBUNTU-CVE-2026-113351
Ubuntu:24.04:LTSwbxml2no fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.04:LTSwbxml2no fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10wbxml2no fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.04:LTSxmlrpc-cno fix listedUBUNTU-CVE-2026-113351
Ubuntu:26.10xmlrpc-cno fix listedUBUNTU-CVE-2026-113351

Affected products (as reported)

VendorProductVersions
libexpat libexpat 2.7.2 – through 2.9.0

Weakness: CWE-909 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References