{"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":0.00326,"epssPercentile":0.25914,"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"],"slug":"CVE-2026-59691","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}