Detections
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Ubuntu 24.04 LTS / 26.04 LTS : zlib vulnerability (USN-8706-1)

medium Nessus Plugin ID 365420

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-8706-1 advisory.

 It was discovered that zlib incorrectly handled negative length parameters in CRC32 combine functions. An attacker could use this issue to cause a denial of service via excessive CPU consumption.

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-8706-1

Plugin Details

Severity: Medium

ID: 365420

File Name: ubuntu_USN-8706-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/13/2026

Updated: 10/13/2026

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: Low

Score: 3

Percentile: 23.67

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2026-27171

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

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

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:lib32z1, p-cpe:/a:canonical:ubuntu_linux:lib64z1, p-cpe:/a:canonical:ubuntu_linux:libminizip1t64, p-cpe:/a:canonical:ubuntu_linux:libx32z1, p-cpe:/a:canonical:ubuntu_linux:minizip, p-cpe:/a:canonical:ubuntu_linux:zlib1g

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/31/2026

Vulnerability Publication Date: 2/10/2026

Reference Information

CVE: CVE-2026-27171

USN: 8706-1