ALAS2-2026-4024

References: CVE-2026-17072  CVE-2026-73433  CVE-2026-73434 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

A flaw was found in GStreamer's gst-plugins-good. A heap-based out-of-bounds read of 4 bytes can occur when parsing FLAC audio stream headers embedded in a Matroska or WebM container file. The vulnerability is triggered by a boundary check that does not account for the full size of the data being copied, allowing a small read past the end of the allocated buffer. An attacker could exploit this by crafting a malicious Matroska or WebM file and tricking a user into opening it, potentially leaking a small amount of adjacent heap memory. (CVE-2026-17072)

A flaw was found in GStreamer gst-plugins-good (avidemux). When parsing FUJIFILM metadata in an AVI strd chunk, gst_avi_demux_parse_strd() decrements a remaining-length counter by fixed offsets (98 and 10 bytes) without verifying sufficient data remains. For crafted strd payloads of exactly 106 or 107 bytes, the counter underflows to a very large unsigned value, causing subsequent null-terminated string scanning to read far beyond the allocated heap buffer. Date-format normalization may also write beyond the buffer end. Confirmed impacts include heap out-of-bounds read, out-of-bounds write, heap information disclosure (adjacent data appearing in parsed metadata), and application crash/denial of service. The avidemux element is auto-plugged by playbin, decodebin, and gst-discoverer, so opening or previewing a crafted AVI is sufficient to trigger the issue. Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072). (CVE-2026-73433)

A flaw was found in GStreamer gst-plugins-good (avidemux). In gst_avi_demux_riff_parse_vprp(), the number of available gst_riff_vprp_video_field_desc entries is calculated by dividing the remaining buffer size by the attacker-controlled vprp->fields value, rather than by sizeof(gst_riff_vprp_video_field_desc). This can cause the parser to treat more field descriptors as available than fit in the input buffer, resulting in out-of-bounds reads. Processing a crafted AVI via playbin/decodebin can crash the application (denial of service). Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072). (CVE-2026-73434)

Issue Correction:
Run yum update gstreamer1-plugins-good or yum update --advisory ALAS2-2026-4024 to update your system.

New Packages:

aarch64:
    gstreamer1-plugins-good-1.18.4-6.amzn2.0.15.aarch64
    gstreamer1-plugins-good-gtk-1.18.4-6.amzn2.0.15.aarch64
    gstreamer1-plugins-good-debuginfo-1.18.4-6.amzn2.0.15.aarch64

i686:
    gstreamer1-plugins-good-1.18.4-6.amzn2.0.15.i686
    gstreamer1-plugins-good-gtk-1.18.4-6.amzn2.0.15.i686
    gstreamer1-plugins-good-debuginfo-1.18.4-6.amzn2.0.15.i686

src:
    gstreamer1-plugins-good-1.18.4-6.amzn2.0.15.src

x86_64:
    gstreamer1-plugins-good-1.18.4-6.amzn2.0.15.x86_64
    gstreamer1-plugins-good-gtk-1.18.4-6.amzn2.0.15.x86_64
    gstreamer1-plugins-good-debuginfo-1.18.4-6.amzn2.0.15.x86_64