CVE-2026-56132

Name	CVE-2026-56132
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1140388

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
expat (PTS)	bullseye	2.2.10-2+deb11u5	vulnerable
	bullseye (security)	2.2.10-2+deb11u7	vulnerable
	bookworm	2.5.0-1+deb12u2	vulnerable
	bookworm (security)	2.5.0-1+deb12u1	vulnerable
	trixie	2.7.1-2	vulnerable
	forky, sid	2.8.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
expat	source	(unstable)	2.8.2-1			1140388

https://github.com/libexpat/libexpat/pull/1272