Detections
Analytics
Amazon Linux 2 : gstreamer-plugins-bad-free, --advisory ALAS2-2026-3791 (ALAS-2026-3791)
high Nessus Plugin ID 325566
Language:
Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of gstreamer-plugins-bad-free installed on the remote host is prior to 0.10.23-42. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3791 advisory.A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash. (CVE-2026-52720)
Multiple out-of-bounds read vulnerabilities were found in GStreamer's pcapparse element. Malformed PCAP records can trigger reads beyond buffer boundaries during IPv4/TCP header parsing. This element is primarily used in debugging pipelines, limiting real-world exposure. A local attacker could trick a user into processing a specially crafted PCAP file, potentially leading to a crash or information disclosure.
(CVE-2026-52721)
A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with large cursor dimensions can overflow signed integer payload-size arithmetic, bypassing a length check and leading to out-of-bounds reads. A remote attacker could trick a user into opening a specially crafted VMnc file, potentially causing a crash or information disclosure. (CVE-2026-52722)
Tenable has extracted the preceding description block directly from the tested product 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
Run 'yum update gstreamer-plugins-bad-free' or or 'yum update --advisory ALAS2-2026-3791' to update your system.See Also
https://alas.aws.amazon.com//AL2/ALAS2-2026-3791.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-52720.html
Plugin Details
Severity: High
ID: 325566
File Name: al2_ALAS-2026-3791.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 7/8/2026
Updated: 7/8/2026
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.9
Percentile: 58.03
CVSS v2
Risk Factor: Medium
Base Score: 4.7
Temporal Score: 3.5
Vector: CVSS2#AV:L/AC:H/Au:N/C:P/I:N/A:C
CVSS Score Source: CVE-2026-52721
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2026-52720
Vulnerability Information
CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:gstreamer-plugins-bad-free, p-cpe:/a:amazon:linux:gstreamer-plugins-bad-free-debuginfo, p-cpe:/a:amazon:linux:gstreamer-plugins-bad-free-devel, p-cpe:/a:amazon:linux:gstreamer-plugins-bad-free-devel-docs
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 7/8/2026
Vulnerability Publication Date: 6/15/2026