Ubuntu Security Notices
Developers issue an Ubuntu Security Notice when a security issue is fixed in an official Ubuntu package. You can find additional guidance for high-profile vulnerabilities in the Ubuntu Vulnerability Knowledge Base section.
To report a security vulnerability in an Ubuntu package, please contact the Security Team.
The Security Team also produces OVAL files for each Ubuntu release. These are an industry-standard machine-readable format dataset that contain details of all known security vulnerabilities and fixes relevant to the Ubuntu release, and can be used to determine whether a particular patch is appropriate. OVAL files can also be used to audit a system to check whether the latest security fixes have been applied.
Search USNs
USN ID, name, description or CVE ID contains
1 - 10 of 10176 results
22 January 2026
pyasn1 could be made to crash if it received specially crafted input.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
22 January 2026
Several security issues were fixed in libxml2.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS,
- 14.04 LTS
CVE ID
CVE-2026-0990, CVE-2026-0989, CVE-2026-0992 + 1 other
21 January 2026
OpenCC could be made to crash if it received specially crafted input.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
21 January 2026
GLib could be made to crash or run programs if it received specially crafted input.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
21 January 2026
Several security issues were fixed in iperf3.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS
CVE ID
CVE-2024-26306, CVE-2023-7250, CVE-2024-53580 + 2 others
19 January 2026
Dungeon Crawl Stone Soup could be made to execute arbitrary code if it opened a specially crafted file.
- Ubuntu 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
19 January 2026
Several security issues were fixed in Apache HTTP Server.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
CVE-2025-65082, CVE-2025-55753, CVE-2025-58098 + 1 other
19 January 2026
Several security issues were fixed in Telegraf
- Ubuntu 22.04 LTS
CVE ID
19 January 2026
Several security issues were fixed in Avahi.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS,
- 14.04 LTS
CVE ID
19 January 2026
USN-7955-1 introduced a regression in urllib3
- Ubuntu 22.04 LTS,
- 20.04 LTS
CVE ID
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