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Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : SRT vulnerabilities (USN-8764-1)

critical Nessus Plugin ID 346232

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8764-1 advisory.

 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8764-1

Plugin Details

Severity: Critical

ID: 346232

File Name: ubuntu_USN-8764-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/16/2026

Updated: 9/16/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.39

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-55869

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libsrt1.4-gnutls, p-cpe:/a:canonical:ubuntu_linux:libsrt1.4-openssl, p-cpe:/a:canonical:ubuntu_linux:libsrt1.5-gnutls, p-cpe:/a:canonical:ubuntu_linux:libsrt1.5-openssl, p-cpe:/a:canonical:ubuntu_linux:libsrt1, p-cpe:/a:canonical:ubuntu_linux:srt-tools

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 9/15/2026

Vulnerability Publication Date: 7/21/2026

Reference Information

CVE: CVE-2026-55868, CVE-2026-55869

USN: 8764-1