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[USN-8764-1] SRT vulnerabilities

Posted on 15 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8764-1
September 15, 2026

srt vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in SRT.

Software Description:
- srt: Secure Reliable Transport UDP streaming library

Details:

It was discovered that SRT did not authenticate certain encryption control
messages. A remote attacker could possibly use this issue to downgrade an
encrypted connection and inject arbitrary content or interrupt a media
stream. (CVE-2026-55868)

It was discovered that SRT did not properly validate certain control
packets during connection setup and key refresh operations. A remote
attacker could possibly use this issue to cause SRT to crash, resulting in
a denial of service. (CVE-2026-55869)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
srt-tools 1.5.4-3ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
srt-tools 1.5.3-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
srt-tools 1.4.4-4ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
srt-tools 1.4.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8764-1
CVE-2026-55868, CVE-2026-55869

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