Unrated
Withdrawn security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- Not specified
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 16:37 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-107611
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
Complete source record
{
"id": "05b07f643c276d14a69de34a15a91501850dc32e8d3045cdd8502ba49eb950ae",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-107611",
"method": "structured",
"payload": {
"kind": "withdrawal",
"title": "UBUNTU-CVE-2026-107611",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-107611",
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-107611",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
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},
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"ecosystem_specific": {
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],
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},
"ecosystem_specific": {
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],
"modified": "2026-10-21T23:00:24.163484502Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-107611",
"https://www.cve.org/CVERecord?id=CVE-2026-107611",
"https://sourceforge.net/p/vnc-tight/bugs/1657/",
"https://www.tightvnc.com/whatsnew.php"
]
},
"related_cves": [
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"value": "CVE-2026-107611",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 401035,
"published_at": "2026-10-13T00:00:00+00:00"
}