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Ubuntu 24.04 LTS / 26.04 LTS : socat vulnerabilities (USN-8511-1)

critical Nessus Plugin ID 325429

Synopsis

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

Description

The remote Ubuntu 24.04 LTS / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8511-1 advisory.

 It was discovered that socat incorrectly handled the SOCKS5 proxy server reply parser. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-56123)

 It was discovered that socat incorrectly handled a sample script. A local attacker could possibly use this issue to overwrite arbitrary files. This issue only affected Ubuntu 24.04 LTS. (CVE-2024-54661)

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 socat package.

See Also

https://ubuntu.com/security/notices/USN-8511-1

Plugin Details

Severity: Critical

ID: 325429

File Name: ubuntu_USN-8511-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/7/2026

Updated: 7/7/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-56123

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:socat, cpe:/o:canonical:ubuntu_linux:24.04:-:lts

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/6/2026

Vulnerability Publication Date: 12/4/2024

Reference Information

CVE: CVE-2024-54661, CVE-2026-56123

USN: 8511-1