{"schema":"threatline.record/2","record":{"id":"CVE-2026-107611","aliases":[],"summary":"Out-of-bounds read in TightVNC Viewer ZRLE palette decoding","details":"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.","categories":["Unclassified"],"product":"TightVNC","vendor":"GlavSoft","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107611","source_modified_at":"2026-10-08T14:03:01.404Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"TightVNC","vendor":"GlavSoft","versions":[{"version":"0","lessThan":"2.8.88","status":"affected","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107611","source_modified_at":"2026-10-08T14:03:01.404Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"TightVNC","ecosystem":null},"version":"2.8.88","basis":"first unaffected version stated in the CVE record"}],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00235,"percentile":0.13711,"score_date":"2026-10-23"},"published_at":"2026-10-08T13:39:48.883Z","modified_at":"2026-10-08T14:03:01.404Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-107611","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-08T14:03:01.404Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-107611","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://sourceforge.net/p/vnc-tight/bugs/1657/","tags":["issue-tracking"]},{"source":"CVE List","url":"https://www.tightvnc.com/whatsnew.php","tags":["release-notes","patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-08T14:02:42.563819Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-08T14:03:01.404Z","content_hash":"00a9dad7b83f2eb083e129609c60239b491d5473746e7798d32d393787488c84"}}