{"id":"CVE-2026-107611","aliases":["EUVD-2026-94975","GHSA-r575-8hw6-vfq3","UBUNTU-CVE-2026-107611"],"status":"published","title":"Out-of-bounds read in TightVNC Viewer ZRLE palette decoding","description":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00236,"percentile":0.14692,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-10-08T13:39:48Z","modified":"2026-10-21T23:00:24Z","products":[{"vendor":"glavsoft","product":"tightvnc"},{"vendor":"kaspersky","product":"tightvnc"}],"references":[{"url":"https://sourceforge.net/p/vnc-tight/bugs/1657/","tags":["issue-tracking","report"]},{"url":"https://www.tightvnc.com/whatsnew.php","tags":["release-notes","patch","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107611"},{"url":"https://sourceforge.net/p/vnc-tight/bugs/1657"},{"url":"https://github.com/advisories/GHSA-r575-8hw6-vfq3"},{"url":"https://ubuntu.com/security/CVE-2026-107611","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107611","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-107611","title":"Out-of-bounds read in TightVNC Viewer ZRLE palette decoding","description":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","status":"published","published":"2026-10-08T13:39:48.883Z","modified":"2026-10-08T14:03:01.404Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-94975","description":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","status":"published","published":"2026-10-08T13:39:48Z","modified":"2026-10-08T14:03:01Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:27:32.642438Z"}],"ghsa":[{"id":"GHSA-r575-8hw6-vfq3","title":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows...","description":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","status":"published","published":"2026-10-08T15:32:58Z","modified":"2026-10-08T15:33:05Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:12:57.235839Z"}],"nvd":[{"id":"CVE-2026-107611","description":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","status":"published","published":"2026-10-08T14:16:49.727Z","modified":"2026-10-08T21:10:00.133Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"UBUNTU-CVE-2026-107611","description":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","status":"withdrawn","published":"2026-10-13T00:00:00Z","modified":"2026-10-21T23:00:24.163484502Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}