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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1917 advisory.

    A denial of service vulnerability was found in GStreamer's AV1 codec parser in gst-plugins-bad. The     gst_av1_parser_parse_tile_list_obu() function passes a byte count to a bit-reader API that expects a bit     count, causing parser desynchronization. A remote attacker could trick a user into opening a specially     crafted AV1 media file, triggering an assertion abort and causing the application to crash.
    (CVE-2026-52718)

    An out-of-bounds read vulnerability was found in the VA JPEG decoder in GStreamer's gst-plugins-bad. The     JPEG parser reads a segment length value from the bitstream without validating it against available data.
    A remote attacker could trick a user into opening a specially crafted JPEG file, causing downstream     parsing to read beyond the provided input buffer, leading to a crash or potential information disclosure.
    (CVE-2026-52719)

    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)

    Multiple out-of-bounds read vulnerabilities were found in GStreamer's pcapparse element. Malformed PCAP     records can trigger reads beyond buffer boundaries during IPv4/TCP header parsing. This element is     primarily used in debugging pipelines, limiting real-world exposure. A local attacker could trick a user     into processing a specially crafted PCAP file, potentially leading to a crash or information disclosure.
    (CVE-2026-52721)

    A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with     large cursor dimensions can overflow signed integer payload-size arithmetic, bypassing a length check and     leading to out-of-bounds reads. A remote attacker could trick a user into opening a specially crafted VMnc     file, potentially causing a crash or information disclosure. (CVE-2026-52722)

    A stack buffer overflow flaw was found in the GStreamer H.265 codec parser library (gst-plugins-bad). When     parsing a buffering period SEI message, the parser uses an incorrect loop bound derived from     cpb_cnt_minus1[i] (the loop index) instead of the sub-layer 0 CPB count cpb_cnt_minus1[0] from the     referenced Sequence Parameter Set. A crafted H.265 video file or stream can cause the parser to write     beyond the bounds of stack-allocated CPB delay arrays, resulting in a crash or potential stack memory     corruption. (CVE-2026-53702)

Tenable has extracted the preceding description block directly from the tested product 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3058-1 advisory.

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

    - 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-2026-53702: 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 remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0205 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2026-52718:
    A denial of service vulnerability was found in GStreamer's AV1 codec parser in gst-plugins-bad. The     gst_av1_parser_parse_tile_list_obu() function passes a byte count to a bit-reader API that expects a bit     count, causing parser desynchronization. A remote attacker could trick a user into opening a specially     crafted AV1 media file, triggering an assertion abort and causing the application to crash.

    CVE-2026-52719:
    An out-of-bounds read vulnerability was found in the VA JPEG decoder in GStreamer's gst-plugins-bad. The     JPEG parser reads a segment length value from the bitstream without validating it against available data.
    A remote attacker could trick a user into opening a specially crafted JPEG file, causing downstream     parsing to read beyond the provided input buffer, leading to a crash or potential information disclosure.

    CVE-2026-52720:
    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-2026-52722:
    A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with     large cursor dimensions can overflow signed integer payload-size arithmetic, bypassing a length check and     leading to out-of-bounds reads. A remote attacker could trick a user into opening a specially crafted VMnc     file, potentially causing a crash or information disclosure.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:36834 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Denial of service via AV1 tile_list_obu parser byte/bit     confusion (CVE-2026-52718)
      * gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds read via JPEG segment length validation in VA     decoder (CVE-2026-52719)
      * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in     librfb (CVE-2026-52720)
      * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload     handling (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1243:01 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)
      * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload     handling (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:36834 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Denial of service via AV1 tile_list_obu parser byte/bit     confusion (CVE-2026-52718)

    * gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds read via JPEG segment length validation in VA     decoder (CVE-2026-52719)

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)

    * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling     (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the RockyLinux 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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:36749 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Denial of service via AV1 tile_list_obu parser byte/bit     confusion (CVE-2026-52718)

    * gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds read via JPEG segment length validation in VA     decoder (CVE-2026-52719)

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)

    * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling     (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the RockyLinux 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 RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:37130 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)

    * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling     (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-37130 advisory.

    - Fix for CVE-2026-52720: librfb framebuffer update rectangle       validation       Resolves: RHEL-184455

Tenable has extracted the preceding description block directly from the Oracle Linux 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 AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:36749 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Denial of service via AV1 tile_list_obu parser byte/bit     confusion (CVE-2026-52718)
      * gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds read via JPEG segment length validation in VA     decoder (CVE-2026-52719)
      * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in     librfb (CVE-2026-52720)
      * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload     handling (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:37130 advisory.

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)
      * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload     handling (CVE-2026-52722)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-36834 advisory.

    - Sync with c9s release -5..-7: fix for CVE-2026-2923, CVE-2026-3082       in dvbsuboverlay and jpegparser       Resolves: RHEL-156242, RHEL-156255
    - Fix bytes/bits confusion in AV1 tile data size parsing       (CVE-2026-52718)       Resolves: RHEL-184388
    - Fix for CVE-2026-52719: vajpegdecoder out-of-bounds read       Resolves: RHEL-184403
    - Fix integer overflows in vmnc decoder (CVE-2026-52722)       Resolves: RHEL-184422
    - Fix for CVE-2026-52720: validate framebuffer update rectangles       in librfb plugin       Resolves: RHEL-184459
    - fix for CVE-2025-3887       Resolves: RHEL-93059

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:37130 advisory.

    GStreamer is a streaming media framework based on graphs of filters which operate on media data. The     gstreamer1-plugins-bad-free package contains a collection of plug-ins for GStreamer.

    Security Fix(es):

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)

    * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling     (CVE-2026-52722)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36834 advisory.

    GStreamer is a streaming media framework based on graphs of filters which operate on media data. The     gstreamer1-plugins-bad-free package contains a collection of plug-ins for GStreamer.

    Security Fix(es):

    * gstreamer1-plugins-bad-free: GStreamer: Denial of service via AV1 tile_list_obu parser byte/bit     confusion (CVE-2026-52718)

    * gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds read via JPEG segment length validation in VA     decoder (CVE-2026-52719)

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)

    * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling     (CVE-2026-52722)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36749 advisory.

    GStreamer is a streaming media framework based on graphs of filters which operate on media data. The     gstreamer1-plugins-bad-free package contains a collection of plug-ins for GStreamer.

    Security Fix(es):

    * gstreamer1-plugins-bad-free: GStreamer: Denial of service via AV1 tile_list_obu parser byte/bit     confusion (CVE-2026-52718)

    * gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds read via JPEG segment length validation in VA     decoder (CVE-2026-52719)

    * gstreamer1-plugins-bad-free: GStreamer: Heap buffer overflow via crafted VNC server rectangle in librfb     (CVE-2026-52720)

    * gstreamer1-plugins-bad-free: GStreamer: Signed integer overflow in VMnc decoder cursor payload handling     (CVE-2026-52722)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 gstreamer-plugins-bad-free installed on the remote host is prior to 0.10.23-42. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3791 advisory.

    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)

    Multiple out-of-bounds read vulnerabilities were found in GStreamer's pcapparse element. Malformed PCAP     records can trigger reads beyond buffer boundaries during IPv4/TCP header parsing. This element is     primarily used in debugging pipelines, limiting real-world exposure. A local attacker could trick a user     into processing a specially crafted PCAP file, potentially leading to a crash or information disclosure.
    (CVE-2026-52721)

    A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with     large cursor dimensions can overflow signed integer payload-size arithmetic, bypassing a length check and     leading to out-of-bounds reads. A remote attacker could trick a user into opening a specially crafted VMnc     file, potentially causing a crash or information disclosure. (CVE-2026-52722)

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

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

An update of the gst package has been released.

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 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)

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

ID	Name	Product	Family	Severity
327394	Amazon Linux 2023 : gstreamer1-plugin-openh264, gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-devel (ALAS2023-2026-1917)	Nessus	Amazon Linux Local Security Checks	high
327301	SUSE SLED15: gstreamer-plugins-bad / gstreamer-plugins-bad-devel / etc (SUSE-SU-2026:3058-1)	Nessus	SuSE Local Security Checks	high
327257	Alibaba Cloud Linux 3 : 0205: gstreamer1-plugins-bad-free (ALINUX3-SA-2026:0205)	Nessus	Alibaba Cloud Linux Local Security Checks	high
326313	AlmaLinux 9 : gstreamer1-plugins-bad-free (ALSA-2026:36834)	Nessus	Alma Linux Local Security Checks	high
326302	MiracleLinux 8 : gstreamer1-plugins-bad-free-1.16.1-8.el8_10 (AXSA:2026-1243:01)	Nessus	Miracle Linux Local Security Checks	high
326268	RockyLinux 9 : gstreamer1-plugins-bad-free (RLSA-2026:36834)	Nessus	Rocky Linux Local Security Checks	high
326266	RockyLinux 10 : gstreamer1-plugins-bad-free (RLSA-2026:36749)	Nessus	Rocky Linux Local Security Checks	high
326225	RockyLinux 8 : gstreamer1-plugins-bad-free (RLSA-2026:37130)	Nessus	Rocky Linux Local Security Checks	high
326093	Oracle Linux 8 : gstreamer1-plugins-bad-free (ELSA-2026-37130)	Nessus	Oracle Linux Local Security Checks	high
326063	AlmaLinux 10 : gstreamer1-plugins-bad-free (ALSA-2026:36749)	Nessus	Alma Linux Local Security Checks	high
326052	AlmaLinux 8 : gstreamer1-plugins-bad-free (ALSA-2026:37130)	Nessus	Alma Linux Local Security Checks	high
326016	Oracle Linux 9 : gstreamer1-plugins-bad-free (ELSA-2026-36834)	Nessus	Oracle Linux Local Security Checks	high
325906	RHEL 8 : gstreamer1-plugins-bad-free (RHSA-2026:37130)	Nessus	Red Hat Local Security Checks	high
325797	RHEL 9 : gstreamer1-plugins-bad-free (RHSA-2026:36834)	Nessus	Red Hat Local Security Checks	high
325735	RHEL 10 : gstreamer1-plugins-bad-free (RHSA-2026:36749)	Nessus	Red Hat Local Security Checks	high
325566	Amazon Linux 2 : gstreamer-plugins-bad-free, --advisory ALAS2-2026-3791 (ALAS-2026-3791)	Nessus	Amazon Linux Local Security Checks	high
324987	Photon OS 4.0: Gst PHSA-2026-4.0-1045	Nessus	PhotonOS Local Security Checks	high
323684	FreeBSD : gstreamer1 -- multiple vulnerabilities (4e82a0e6-6801-42c6-8fb6-91b6b275a9e1)	Nessus	FreeBSD Local Security Checks	high
321144	Linux Distros Unpatched Vulnerability : CVE-2026-52720	Nessus	Misc.	high

Detections

Analytics

CVE-2026-52720

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Tenable Plugins

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