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 10759 results
5 June 2026
YARD could be made to expose sensitive information over the network.
- Ubuntu 26.04 LTS,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
4 June 2026
Several security issues were fixed in Nano.
- Ubuntu 26.04 LTS,
- 25.10 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS
CVE ID
4 June 2026
Several security issues were fixed in Robocode.
- Ubuntu 26.04 LTS,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
CVE-2025-14307, CVE-2025-14306, CVE-2025-14308 + 1 other
4 June 2026
Several security issues were fixed in Tomcat.
- Ubuntu 16.04 LTS,
- 14.04 LTS
CVE ID
4 June 2026
Apache HTTP Server could be made to consume excessive resources if it received specially crafted network traffic.
- Ubuntu 26.04 LTS,
- 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
3 June 2026
Postfix could be made to crash if it received specially crafted network traffic.
- Ubuntu 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS,
- 14.04 LTS
CVE ID
3 June 2026
Several security issues were fixed in Exim.
- Ubuntu 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS,
- 14.04 LTS
CVE ID
CVE-2026-40687, CVE-2026-45185, CVE-2026-40685 + 3 others
3 June 2026
Twisted could be made to crash if it received specially crafted network traffic.
- Ubuntu 26.04 LTS,
- 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
3 June 2026
Several security issues were fixed in urllib3.
- Ubuntu 26.04 LTS,
- 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
3 June 2026
libwww-perl could be made to expose sensitive information over the network.
- Ubuntu 26.04 LTS,
- 25.10 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
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