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-6501-1: RabbitMQ vulnerability

21 November 2023

RabbitMQ could be made to denial of service if it received a specially crafted HTTP request.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS

CVE ID

CVE-2023-46118

USN-6500-1: Squid vulnerabilities

21 November 2023

Several security issues were fixed in Squid.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS

CVE ID

CVE-2023-46724, CVE-2023-46848, CVE-2023-46846 + 2 others

USN-6499-1: GnuTLS vulnerability

21 November 2023

GnuTLS could be made to expose sensitive information over the network.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS

CVE ID

CVE-2023-5981

USN-6498-1: FRR vulnerabilities

21 November 2023

Several security issues were fixed in FRR.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS

CVE ID

CVE-2023-38407, CVE-2023-38406, CVE-2023-47235 + 1 other

USN-6492-1: Mosquitto vulnerabilities

21 November 2023

Several security issues were fixed in Mosquitto.

  • Ubuntu 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS

CVE ID

CVE-2023-0809, CVE-2021-34434, CVE-2023-28366 + 3 others

USN-6493-1: hibagent update

21 November 2023

A security improvement was added to hibagent.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS

USN-6489-1: Tang vulnerability

20 November 2023

Tang could allow unintended access to secret keys.

  • Ubuntu 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2023-1672

USN-6490-1: WebKitGTK vulnerabilities

20 November 2023

Several security issues were fixed in WebKitGTK.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS

CVE ID

CVE-2023-41983, CVE-2023-42852

USN-6488-1: strongSwan vulnerability

20 November 2023

strongSwan could be made to crash or run programs if it received specially crafted network traffic.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS

CVE ID

CVE-2023-41913

USN-6487-1: Avahi vulnerabilities

20 November 2023

Avahi could be made to crash if it received specially crafted input.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-38469, CVE-2023-38471, CVE-2023-38472 + 2 others

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