CVE-2026-0990
Publication date 15 January 2026
Last updated 22 January 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libxml2 | 25.10 questing |
Fixed 2.14.5+dfsg-0.2ubuntu0.1
|
| 24.04 LTS noble |
Fixed 2.9.14+dfsg-1.3ubuntu3.7
|
|
| 22.04 LTS jammy |
Fixed 2.9.13+dfsg-1ubuntu0.11
|
|
| 20.04 LTS focal |
Fixed 2.9.10+dfsg-5ubuntu0.20.04.10+esm4
|
|
| 18.04 LTS bionic |
Fixed 2.9.4+dfsg1-6.1ubuntu1.9+esm7
|
|
| 16.04 LTS xenial |
Fixed 2.9.3+dfsg1-1ubuntu0.7+esm12
|
|
| 14.04 LTS trusty |
Fixed 2.9.1+dfsg1-3ubuntu4.13+esm11
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.9 · Medium
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-7974-1
- libxml2 vulnerabilities
- 22 January 2026