| Name | CVE-2026-6653 |
| Description | Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling. |
| 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+deb11u10 | vulnerable |
| bookworm | 2.9.14+dfsg-1.3~deb12u6 | vulnerable |
| bookworm (security) | 2.9.14+dfsg-1.3~deb12u4 | vulnerable |
| trixie | 2.12.7+dfsg+really2.9.14-2.1+deb13u3 | vulnerable |
| trixie (security) | 2.12.7+dfsg+really2.9.14-2.1+deb13u1 | vulnerable |
| forky, sid | 2.15.3+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libxml2 | source | (unstable) | 2.14.5+dfsg-0.1 | | | |
Notes
[trixie] - libxml2 <no-dsa> (Minor issue)
[bookworm] - libxml2 <postponed> (Minor issue; UAF present via CVE-2021-3541 backport, fix only in 2.11.0)
[bullseye] - libxml2 <postponed> (Minor issue; UAF present via CVE-2021-3541 backport, fix only in 2.11.0)
https://www.openwall.com/lists/oss-security/2026/06/22/3
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058
Fixed by: https://gitlab.gnome.org/GNOME/libxml2/-/commit/463bbeeca1805b5c4828f50d0fefc4eebaf620df (v2.11.0)
Mark 2.14.5+dfsg-0.1 as the first version fixed in unstable as from 2.12.7+dfsg-1
the version was reverted back to a 2.9.14 based one.