ALAS2023-2026-3424

References: CVE-2026-119727  CVE-2026-119728  CVE-2026-119729 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

A flaw was found in GStreamer's gst-plugins-bad H.265 video parser. When parsing a specially crafted H.265 bitstream containing a Screen Content Coding (SCC) extension with certain palette predictor initializer settings, an integer underflow in the upper-bound computation allows the parser to accept an out-of-range value for the number of palette predictor entries. This causes the parser to write beyond the end of a fixed-size array, resulting in memory corruption and an application crash. Successful exploitation requires an attacker to provide a malformed H.265 media file to a vulnerable application, and is limited to a denial-of-service impact. (CVE-2026-119727)

A flaw was found in the H.264 video parser in gst-plugins-bad. When processing a specially crafted H.264 video file with malformed Multiview (MVC) Sequence Parameter Set data, the parser can dereference a NULL pointer during the cleanup of partially allocated internal structures after a parse failure. This can cause the application using GStreamer to crash, resulting in a denial of service. (CVE-2026-119728)

A flaw was found in GStreamer. An integer overflow vulnerability in the AV1 LEB128 variable-length integer parser allows a remote attacker to cause a crash in applications that process AV1 media content. By crafting a malformed AV1 bitstream containing an invalid LEB128-encoded value, an attacker can cause integer overflow in the parser, resulting in incorrect length values being used during stream processing, which can lead to a denial of service. (CVE-2026-119729)

Issue Correction:
Run dnf update gstreamer1-plugins-bad-free --releasever 2023.12.20261112 or dnf update --advisory ALAS2023-2026-3424 --releasever 2023.12.20261112 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    gstreamer1-plugin-openh264-debuginfo-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugins-bad-free-libs-debuginfo-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugins-bad-free-devel-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugin-openh264-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugins-bad-free-libs-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugins-bad-free-debuginfo-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugins-bad-free-1.24.10-1.amzn2023.0.10.aarch64
    gstreamer1-plugins-bad-free-debugsource-1.24.10-1.amzn2023.0.10.aarch64

src:
    gstreamer1-plugins-bad-free-1.24.10-1.amzn2023.0.10.src

x86_64:
    gstreamer1-plugins-bad-free-libs-debuginfo-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugin-openh264-debuginfo-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugin-openh264-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugins-bad-free-devel-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugins-bad-free-libs-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugins-bad-free-debuginfo-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugins-bad-free-debugsource-1.24.10-1.amzn2023.0.10.x86_64
    gstreamer1-plugins-bad-free-1.24.10-1.amzn2023.0.10.x86_64