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    CVE-2026-12891

    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.

    Published:Jun 23, 2026
    Last Modified:Jun 24, 2026
    EPS:Jun 23, 2026
    EPSS Score:0.00265
    CVSS Score:4.3

    Affected Products

    Vendor
    Gstreamer Project
    Product
    Gstreamer Plugin
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-12892 (CVSS 4.4) — A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file …
    CVE-2026-52719 (CVSS 7.1) — An out-of-bounds read vulnerability was found in the VA JPEG decoder in GStreamer's gst-plugins-bad. The JPEG …
    CVE-2026-52721 (CVSS 5.3) — Multiple out-of-bounds read vulnerabilities were found in GStreamer's pcapparse element. Malformed PCAP record…
    CVE-2026-52720 (CVSS 8.8) — A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds ch…
    CVE-2026-52722 (CVSS 7.1) — A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with larg…
    CVE-2026-52718 (CVSS 6.5) — A denial of service vulnerability was found in GStreamer's AV1 codec parser in gst-plugins-bad. The gst_av1_pa…
    CVE-2026-53704 (CVSS 7.1) — A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia…
    CVE-2026-53705 (CVSS 7.6) — A flaw was found in GStreamer's WavPack audio decoder in gst-plugins-good. When processing a specially crafted…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High