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Ubuntu 25.10 : HAProxy vulnerability (USN-8036-1)

high Nessus Plugin ID 299056

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 25.10 host has packages installed that are affected by a vulnerability as referenced in the USN-8036-1 advisory.

 Asim Viladi Oglu Manizada discovered that HAProxy incorrectly handled certain INITIAL packets. A remote attacker could possibly use this issue to cause HAProxy to crash, 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 haproxy and / or vim-haproxy packages.

See Also

https://ubuntu.com/security/notices/USN-8036-1

Plugin Details

Severity: High

ID: 299056

File Name: ubuntu_USN-8036-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/14/2026

Updated: 2/14/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-26081

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:vim-haproxy, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:haproxy

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/12/2026

Vulnerability Publication Date: 2/12/2026

Reference Information

CVE: CVE-2026-26081

USN: 8036-1