CVE-2026-1757

Name	CVE-2026-1757
Description	A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libxml2 (PTS)	bullseye	2.9.10+dfsg-6.7+deb11u4	vulnerable
	bullseye (security)	2.9.10+dfsg-6.7+deb11u9	vulnerable
	bookworm	2.9.14+dfsg-1.3~deb12u5	vulnerable
	bookworm (security)	2.9.14+dfsg-1.3~deb12u4	vulnerable
	trixie	2.12.7+dfsg+really2.9.14-2.1+deb13u2	vulnerable
	trixie (security)	2.12.7+dfsg+really2.9.14-2.1+deb13u1	vulnerable
	forky, sid	2.15.1+dfsg-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libxml2	source	(unstable)	(unfixed)	unimportant

Notes

https://gitlab.gnome.org/GNOME/libxml2/-/issues/1009
Fixed by: https://gitlab.gnome.org/GNOME/libxml2/-/commit/160c8a43ba37dfb07ebe6446fbad9d0973d9279d
Negligible security impact, memory leak in xmllint CLI utility