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Vulnerability · Published Jun 19, 2026 · Assigned by mitre

CVE-2026-56132

Medium 6.9

In plain English

A medium-severity security flaw in libexpat from libexpat project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.9Medium
Exploit odds (30 days)0.1%top 97.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10expat2.7.3-1.el10_2.3ALSA-2026:64810
AlmaLinux:8expat2.5.0-2.el8_10.2ALSA-2026:64809
AlmaLinux:9expat2.5.0-6.el9_8.3ALSA-2026:64812
AlmaLinux:10expat-devel2.7.3-1.el10_2.3ALSA-2026:64810
AlmaLinux:8expat-devel2.5.0-2.el8_10.2ALSA-2026:64809
AlmaLinux:9expat-devel2.5.0-6.el9_8.3ALSA-2026:64812
Alpine:v3.21expat2.8.2-r0ALPINE-CVE-2026-56132
Alpine:v3.22expat2.8.2-r0ALPINE-CVE-2026-56132
Alpine:v3.23expat2.8.2-r0ALPINE-CVE-2026-56132
Alpine:v3.24expat2.8.2-r0ALPINE-CVE-2026-56132
Debian:12expat2.5.0-1+deb12u5DEBIAN-CVE-2026-56132
Debian:13expat2.8.2-1~deb13u1DEBIAN-CVE-2026-56132
Debian:14expat2.8.2-1DEBIAN-CVE-2026-56132
Rocky Linux:10expat0:2.7.3-1.el10_2.3RLSA-2026:64810
Rocky Linux:8expat0:2.5.0-2.el8_10.2RLSA-2026:64809
Rocky Linux:9expat0:2.5.0-6.el9_8.3RLSA-2026:64812
Ubuntu:22.04:LTScadaverno fix listedUBUNTU-CVE-2026-56132
Ubuntu:24.04:LTScadaverno fix listedUBUNTU-CVE-2026-56132
Ubuntu:25.10cadaverno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.04:LTScadaverno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.10cadaverno fix listedUBUNTU-CVE-2026-56132
Ubuntu:22.04:LTSexpat2.4.7-1ubuntu0.9UBUNTU-CVE-2026-56132
Ubuntu:22.04:LTSexpat2.4.7-1ubuntu0.9USN-8813-1
Ubuntu:24.04:LTSexpat2.6.1-2ubuntu0.6UBUNTU-CVE-2026-56132
Ubuntu:24.04:LTSexpat2.6.1-2ubuntu0.6USN-8813-1
Ubuntu:25.10expatno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.04:LTSexpat2.7.4-1ubuntu0.2USN-8813-1
Ubuntu:26.04:LTSexpat2.7.4-1ubuntu0.2UBUNTU-CVE-2026-56132
Ubuntu:22.04:LTSinsighttoolkit4no fix listedUBUNTU-CVE-2026-56132
Ubuntu:22.04:LTSmatanzano fix listedUBUNTU-CVE-2026-56132
Ubuntu:24.04:LTSmatanzano fix listedUBUNTU-CVE-2026-56132
Ubuntu:25.10matanzano fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.04:LTSmatanzano fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.10matanzano fix listedUBUNTU-CVE-2026-56132
Ubuntu:25.10swish-eno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.10swish-eno fix listedUBUNTU-CVE-2026-56132
Ubuntu:22.04:LTStdomno fix listedUBUNTU-CVE-2026-56132
Ubuntu:24.04:LTStdomno fix listedUBUNTU-CVE-2026-56132
Ubuntu:25.10tdomno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.04:LTStdomno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.10tdomno fix listedUBUNTU-CVE-2026-56132
Ubuntu:22.04:LTSwbxml2no fix listedUBUNTU-CVE-2026-56132
Ubuntu:24.04:LTSwbxml2no fix listedUBUNTU-CVE-2026-56132
Ubuntu:25.10wbxml2no fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.04:LTSwbxml2no fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.10wbxml2no fix listedUBUNTU-CVE-2026-56132
Ubuntu:25.10xmlrpc-cno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.04:LTSxmlrpc-cno fix listedUBUNTU-CVE-2026-56132
Ubuntu:26.10xmlrpc-cno fix listedUBUNTU-CVE-2026-56132

Affected products (as reported)

VendorProductVersions
libexpat project libexpat 0 – before 2.8.2

Weakness: CWE-821 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

References