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Ubuntu 24.04 LTS / 26.04 LTS : Protocol Buffers vulnerability (USN-8943-1)

medium Nessus Plugin ID 369511

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8943-1 advisory.

 It was discovered that Protocol Buffers did not properly handle negative varint lengths or enforce recursion limits when parsing input in the PHP library. An attacker could possibly use this issue to cause applications using Protocol Buffers to crash or consume resources, resulting in a denial of service.

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

Note that Nessus has not tested for this issue 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-8943-1

Plugin Details

Severity: Medium

ID: 369511

File Name: ubuntu_USN-8943-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/21/2026

Updated: 10/21/2026

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:elpa-protobuf-mode, p-cpe:/a:canonical:ubuntu_linux:libprotobuf-java, p-cpe:/a:canonical:ubuntu_linux:libprotobuf-lite32t64, p-cpe:/a:canonical:ubuntu_linux:libprotobuf32t64, p-cpe:/a:canonical:ubuntu_linux:libprotoc32t64, p-cpe:/a:canonical:ubuntu_linux:php-google-protobuf, p-cpe:/a:canonical:ubuntu_linux:protobuf-compiler, p-cpe:/a:canonical:ubuntu_linux:python3-protobuf, p-cpe:/a:canonical:ubuntu_linux:ruby-google-protobuf

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/20/2026

Vulnerability Publication Date: 10/20/2026

Reference Information

USN: 8943-1