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.
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USN ID, name, description or CVE ID contains
1 - 10 of 818 results
12 January 2026
urllib3 could be made to use excessive resources if it received specially crafted network traffic.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS
CVE ID
12 January 2026
Libtasn1 could be made to crash if it received specially crafted input.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
12 January 2026
Python could be made to crash if it received specially crafted network traffic.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS
CVE ID
12 January 2026
Several security issues were fixed in PHP.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS
CVE ID
12 January 2026
Several security issues were fixed in libheif.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS
CVE ID
9 January 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 24.04 LTS
CVE ID
CVE-2025-38666, CVE-2025-37958, CVE-2025-40018 + 2 others
9 January 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 24.04 LTS
CVE ID
CVE-2025-38575, CVE-2025-22039, CVE-2025-22057 + 70 others
8 January 2026
Several security issues were fixed in Tornado.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
8 January 2026
Sodium could be made to expose sensitive information.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
8 January 2026
Several security issues were fixed in GPSd.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS
CVE ID
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