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Linux Distros Unpatched Vulnerability : CVE-2026-5673

critical Nessus Plugin ID 305062

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap. (CVE-2026-5673)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-5673

Plugin Details

Severity: Critical

ID: 305062

File Name: unpatched_CVE_2026_5673.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 4/6/2026

Updated: 4/6/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.4

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

CVSS Score Source: CVE-2026-5673

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.3

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:U/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:libtheora, p-cpe:/a:centos:centos:libtheora-devel, p-cpe:/a:centos:centos:theora-tools, p-cpe:/a:redhat:enterprise_linux:libtheora, p-cpe:/a:redhat:enterprise_linux:libtheora-devel, p-cpe:/a:redhat:enterprise_linux:theora-tools, p-cpe:/a:centos:centos:libtheora-devel-docs, p-cpe:/a:redhat:enterprise_linux:libtheora-devel-docs, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:9

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 4/6/2026

Reference Information

CVE: CVE-2026-5673