Amazon Linux 2 Security Advisory: ALAS2-2026-3832
Advisory Released Date: 2026-08-04
Advisory Updated Date: 2026-08-04
Severity:
Important
Issue Overview:
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)
Affected Packages:
gstreamer1-plugins-bad-free
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update gstreamer1-plugins-bad-free or yum update --advisory ALAS2-2026-3832 to update your system.
New Packages:
aarch64:
gstreamer1-plugins-bad-free-1.18.4-5.amzn2.0.8.aarch64
gstreamer1-plugins-bad-free-devel-1.18.4-5.amzn2.0.8.aarch64
gstreamer1-plugins-bad-free-debuginfo-1.18.4-5.amzn2.0.8.aarch64
src:
gstreamer1-plugins-bad-free-1.18.4-5.amzn2.0.8.src
x86_64:
gstreamer1-plugins-bad-free-1.18.4-5.amzn2.0.8.x86_64
gstreamer1-plugins-bad-free-devel-1.18.4-5.amzn2.0.8.x86_64
gstreamer1-plugins-bad-free-debuginfo-1.18.4-5.amzn2.0.8.x86_64