| Name | CVE-2026-0992 |
| Description | A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition. |
| 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 | 1125696 |
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 | 2.15.2+dfsg-0.1 | fixed | |
| 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) | 2.15.2+dfsg-0.1 | 1125696 |
[trixie] - libxml2 <no-dsa> (Minor issue)
[bookworm] - libxml2 <no-dsa> (Minor issue)
[bullseye] - libxml2 <postponed> (Minor issue, DoS)
https://gitlab.gnome.org/GNOME/libxml2/-/issues/1019
Fixed by: https://gitlab.gnome.org/GNOME/libxml2/-/commit/f75abfcaa419a740a3191e56c60400f3ff18988d
Follow-up: https://gitlab.gnome.org/GNOME/libxml2/-/commit/deed3b7873dff30b7f87f7f33154c9932a772522
Tests: https://gitlab.gnome.org/GNOME/libxml2/-/commit/f8399e62a31095bf1ced01827c33f9b29494046f
Fixed by: https://gitlab.gnome.org/GNOME/libxml2/-/commit/4af23b523de5b72f27faf3e8e8a99dde5f7b82a2 (v2.15.2)
Follow-up: https://gitlab.gnome.org/GNOME/libxml2/-/commit/096402c942e9d9a049f283eb4e6da431289900e1 (v2.15.2)
Tests: https://gitlab.gnome.org/GNOME/libxml2/-/commit/f14c733327f163b49a632f03d05a58c119ed7e57 (v2.15.2)