Linux Distros Unpatched Vulnerability : CVE-2026-12891

medium Nessus Plugin ID 323646

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 the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.
(CVE-2026-12891)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 323646

File Name: unpatched_CVE_2026_12891.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 6/29/2026

Updated: 6/29/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.9

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 4

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

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

CVSS Score Source: CVE-2026-12891

Vulnerability Information

CPE: p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-libs, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-devel, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-devel, p-cpe:/a:debian:debian_linux:gst-plugins-bad1.0, cpe:/o:redhat:enterprise_linux:8, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-libs, cpe:/o:debian:debian_linux:14.0, cpe:/o:debian:debian_linux:12.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/23/2026

Reference Information

CVE: CVE-2026-12891

Detections

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