| Name | CVE-2026-0990 |
| Description | A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a segmentation fault, causing a Denial of Service (DoS) by crashing affected applications. |
| 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 | 1125695 |
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) | | | 1125695 |
Notes
[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/1018
Fixed by: https://gitlab.gnome.org/GNOME/libxml2/-/commit/1961208e958ca22f80a0b4e4c9d71cfa050aa982