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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-12891)

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6458 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6458-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     August 21, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : gst-plugins-bad1.0     CVE ID         : CVE-2026-12891 CVE-2026-12892 CVE-2026-19387                      CVE-2026-52720 CVE-2026-52722

    Multiple security vulnerabilities were discovered in plugins for     the GStreamer media framework and its codecs and demuxers, which     may result in denial of service or potentially the execution of     arbitrary code if a malformed media file is opened.

    For the stable distribution (trixie), these problems have been fixed in     version 1.26.2-3+deb13u3.

    We recommend that you upgrade your gst-plugins-bad1.0 packages.

    For the detailed security status of gst-plugins-bad1.0 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/gst-plugins-bad1.0

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21370-1 advisory.

    This update for gstreamer-plugins-bad fixes the following issues

    - CVE-2026-12891: unchecked aspect_ratio_idc value used as an array index in the H.266 parser could cause     a global out-       of-bounds read (bsc#1268872).
    - CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
    - CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check     (bsc#1271051).
    - CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-     of-bounds write       (bsc#1268406).
    - CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read       (bsc#1268408).
    - CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer     (bsc#1268410).
    - CVE-2026-53701: multi-slice-in-tile partitions without slice index bounds checks could trigger an out-     of-bounds write       (bsc#1268172).
    - CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer     overflow       (bsc#1268168).
    - CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a     stack buffer       overflow (bsc#1271168).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 4e82a0e6-6801-42c6-8fb6-91b6b275a9e1 advisory.

    The GStreamer project reports:
    Multiple security issues were identified and fixed in the GStreamer framework.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-12891)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
465597	Echo: gst-plugins-bad1.0: security update to 1.26.2-3+deb13u3	Tenable Cloud Security	Echo Local Security Checks	Local	medium
465597	Echo: gst-plugins-bad1.0: security update to 1.26.2-3+deb13u3	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
338785	Debian dsa-6458 : gir1.2-gst-plugins-bad-1.0 - security update	Nessus	Debian Local Security Checks	Local	high
328916	openSUSE 16: gstreamer-plugins-bad / gstreamer-plugins-bad-chromaprint / etc (openSUSE-SU-2026:21370-1)	Nessus	SuSE Local Security Checks	Local	high
323684	FreeBSD : gstreamer1 -- multiple vulnerabilities (4e82a0e6-6801-42c6-8fb6-91b6b275a9e1)	Nessus	FreeBSD Local Security Checks	Local	high
323646	Linux Distros Unpatched Vulnerability : CVE-2026-12891	Nessus	Misc.	Local	medium

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