--- id: CVE-2026-59691 title: A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin summary: >- 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 wri… severity: high cvss: 7.1 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H' cwe: - CWE-787 published: '2026-07-09' updated: '2026-08-03' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59691' references: - url: 'https://access.redhat.com/errata/RHSA-2026:47179' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:47180' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:47731' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-59691' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2497343' label: secalert@redhat.com - url: >- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100 label: secalert@redhat.com - url: 'https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:54658' label: 'RHSA-2026:54658' - url: 'https://access.redhat.com/errata/RHSA-2026:54659' label: 'RHSA-2026:54659' - url: 'https://access.redhat.com/errata/RHSA-2026:54660' label: 'RHSA-2026:54660' - url: 'https://access.redhat.com/errata/RHSA-2026:54664' label: 'RHSA-2026:54664' - url: 'https://access.redhat.com/errata/RHSA-2026:54665' label: 'RHSA-2026:54665' - url: 'https://access.redhat.com/errata/RHSA-2026:54752' label: 'RHSA-2026:54752' - url: 'https://access.redhat.com/errata/RHSA-2026:56658' label: 'RHSA-2026:56658' - url: 'https://access.redhat.com/errata/RHSA-2026:56772' label: 'RHSA-2026:56772' - url: 'https://access.redhat.com/errata/RHSA-2026:62532' label: 'RHSA-2026:62532' - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59691.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-59691' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59691' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.00599 epssPercentile: 0.46399 ingestedAt: '2026-08-03T10:24:20.412Z' vendor: Red Hat product: gstreamer1-plugins-bad-free affected: - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer1-plugins-bad-free (all versions) - gstreamer-plugins-bad-free (all versions) ssvc: exploitation: none automatable: 'no' technicalImpact: partial timestamp: '2026-07-09T13:50:29.784295Z' patched: - enterprise_linux_server_v_7_els - enterprise_linux_server_optional_v_7_els - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_aus_v_8_6 - enterprise_linux_appstream_eus_extension_v_8_6 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - enterprise_linux_codeready_linux_builder_eus_v_10_0 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - codeready_linux_builder_eus_v_9_6 - enterprise_linux_codeready_linux_builder_v_9 --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:62532** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62532) - **RHSA-2026:54752** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-08-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:54752) - **RHSA-2026:54659** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54659) - **RHSA-2026:47180** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-07-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:47180) - **RHSA-2026:47731** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-07-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:47731) - **RHSA-2026:56772** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56772) - **RHSA-2026:54665** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54665) - **RHSA-2026:54664** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54664) - **RHSA-2026:56658** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56658) - **RHSA-2026:54658** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54658) - **RHSA-2026:54660** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54660) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59691.json)