---
title: "CVE-2026-0992\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-0992?format=md
keywords: index, follow
---

# CVE-2026-0992

Publication date 15 January 2026

Last updated 22 January 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**2.9 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2026-0992?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| 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  Ubuntu Pro |
| 18.04 LTS bionic | Fixed 2.9.4+dfsg1-6.1ubuntu1.9+esm7  Ubuntu Pro |
| 16.04 LTS xenial | Fixed 2.9.3+dfsg1-1ubuntu0.7+esm12  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 2.9.1+dfsg1-3ubuntu4.13+esm11  Ubuntu Pro |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

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## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

2.9 · Low

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Local |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | Low |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 2.9 · Low |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-0992)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-0992)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-0992)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-0992)

### Related Ubuntu Security Notices (USN)

+ [USN-7974-1](https://usn.ubuntu.com/USN-7974-1)
+ libxml2 vulnerabilities
+ 22 January 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-0992>
* <https://access.redhat.com/security/cve/CVE-2026-0992>