Public vulnerability disclosure
CVE-2026-59691
Gstreamer1-plugins-bad-free: gstreamer: rfbsrc/librfb hextile heap out-of-bounds write with 16bpp framebuffer
publishedCWE-787
A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.
Technical severity7.1 highCVSS 3.1 · CNA: redhat
Published2026-07-09Source updated 2026-11-04
Collected2026-11-053 attributed sources
Fixes and workarounds
Workaround
There is no complete mitigation for this vulnerability. The following measures can reduce risk: 1. Do not connect GStreamer pipelines using rfbsrc to untrusted or unknown VNC servers. 2. If the rfbsrc plugin is not required, remove the librfb plugin shared object from the GStreamer plugins directory (typically /usr/lib64/gstreamer-1.0/libgstrfbsrc.so). 3. Network-level controls (firewall rules) can restrict outbound VNC connections to trusted servers only.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Red Hat Enterprise Linux 10 Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.26.7-2.el10_2.6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.24.11-3.el10_0.6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.10.4-7.el7_9; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat gstreamer-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:0.10.23-26.el7_9; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-9.el8_10.1; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-4.el8_4.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-4.el8_4.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-4.el8_6.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-4.el8_6.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-4.el8_8.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.16.1-4.el8_8.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.22.12-7.el9_8.3; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.18.4-9.el9_2.5; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.22.1-6.el9_4.6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat gstreamer1-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.22.12-5.el9_6.6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 6 Red Hat gstreamer-plugins-bad-free
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.1 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H | CNA: redhat |
| 3.1 / 7.1 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2026:47179CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:47180CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:47731CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54658CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54659CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54660CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54664CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54665CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54752CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:56658CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:56772CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:62532CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-59691CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2497343CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100CNA: redhat
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173CNA: redhat
- https://access.redhat.com/errata/RHSA-2026:47179[email protected]
- https://access.redhat.com/errata/RHSA-2026:47180[email protected]
- https://access.redhat.com/errata/RHSA-2026:47731[email protected]
- https://access.redhat.com/errata/RHSA-2026:54658[email protected]
- https://access.redhat.com/errata/RHSA-2026:54659[email protected]
- https://access.redhat.com/errata/RHSA-2026:54660[email protected]
- https://access.redhat.com/errata/RHSA-2026:54664[email protected]
- https://access.redhat.com/errata/RHSA-2026:54665[email protected]
- https://access.redhat.com/errata/RHSA-2026:54752[email protected]
- https://access.redhat.com/errata/RHSA-2026:56658[email protected]
- https://access.redhat.com/errata/RHSA-2026:56772[email protected]
- https://access.redhat.com/errata/RHSA-2026:62532[email protected]
- https://access.redhat.com/security/cve/CVE-2026-59691[email protected]
- https://bugzilla.redhat.com/show_bug.cgi?id=2497343[email protected]
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100[email protected]
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173[email protected]
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