HighFix available
italc, libvncserver and 4 more products — security advisory
LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.
- Products
- italc, libvncserver, tightvnc, veyon, vino, x11vnc
- Affected versions
- 0.9.10+dfsg-3, 0.9.10+dfsg-3build1, 0.9.10+dfsg-3ubuntu0.16.04.1, 0.9.10+dfsg-3ubuntu0.16.04.2, 0.9.10+dfsg-3ubuntu0.16.04.3, 0.9.10+dfsg-3ubuntu0.16.04.4, 0.9.10+dfsg-3ubuntu0.16.04.5, 0.9.10+dfsg-3ubuntu0.16.04.6, 0.9.11+dfsg-1, 0.9.11+dfsg-1.3, 0.9.11+dfsg-1ubuntu1, 0.9.11+dfsg-1ubuntu1.1, 0.9.11+dfsg-1ubuntu1.2, 0.9.11+dfsg-1ubuntu1.3, 0.9.11+dfsg-1ubuntu1.4, 0.9.12+dfsg-3ubuntu3, 0.9.12+dfsg-6, 0.9.12+dfsg-7, 0.9.12+dfsg-8, 0.9.12+dfsg-9, 0.9.12+dfsg-9ubuntu0.1, 0.9.12+dfsg-9ubuntu0.2, 0.9.12+dfsg-9ubuntu0.3, 0.9.13+dfsg-3, 0.9.13+dfsg-3build1, 0.9.13+dfsg-3build2, 0.9.13-1.1, 0.9.13-1.2build1, 0.9.13-1.2ubuntu0.1~esm1, 0.9.13-2, 0.9.13-2build1, 0.9.13-3, 0.9.13-3ubuntu0.1~esm1, 0.9.13-6, 0.9.14+dfsg-1, 0.9.14+dfsg-1build1, 0.9.14+dfsg-1build2, 0.9.15+dfsg-1, 0.9.16-10, 0.9.16-3, 0.9.16-3ubuntu0.1~esm1, 0.9.16-7, 0.9.16-7build1, 0.9.16-8, 0.9.16-9, 0.9.16-9ubuntu1, 0.9.17-1, 0.9.17-2, 0.9.17-3, 0.9.17-3build1, 1.3.10-0ubuntu2, 1.3.10-0ubuntu3, 1.3.10-0ubuntu4, 1.3.10-0ubuntu5, 1.3.9-6.4, 1.3.9-6.4ubuntu1, 1.3.9-6.5+deb8u1build0.14.04.1~esm1, 1:1.3.10-10, 1:1.3.10-10build1, 1:1.3.10-11, 1:1.3.10-3, 1:1.3.10-5, 1:1.3.10-7, 1:1.3.10-7build1, 1:1.3.10-7build2, 1:1.3.10-8, 1:1.3.10-9, 1:2.0.2+dfsg1-3, 1:2.0.2+dfsg1-4, 1:2.0.2+dfsg1-4ubuntu0.1, 1:3.0.3+dfsg1-1, 1:3.0.3+dfsg1-2, 1:3.0.3+dfsg1-2build1, 1:3.0.3+dfsg1-2ubuntu1, 1:3.0.3+dfsg1-3, 1:3.0.3+dfsg1-3ubuntu0.1, 3.22.0-2ubuntu1, 3.22.0-3ubuntu1, 3.22.0-3ubuntu1.1, 3.22.0-3ubuntu1.2, 3.22.0-5ubuntu2, 3.22.0-5ubuntu2.1, 3.22.0-5ubuntu2.2, 3.22.0-6ubuntu3, 3.22.0-6ubuntu4, 3.22.0-6ubuntu5, 3.22.0-7ubuntu1, 3.8.1-0ubuntu12, 3.8.1-0ubuntu6, 3.8.1-0ubuntu7, 3.8.1-0ubuntu8, 3.8.1-0ubuntu9, 3.8.1-0ubuntu9.1, 3.8.1-0ubuntu9.2, 3.8.1-0ubuntu9.3, 3.8.1-0ubuntu9.4, 4.2.4+repack1-2, 4.2.5+repack1-1, 4.3.1+repack1-1, 4.3.1+repack1-2, 4.3.1+repack1-2build1, 4.3.1+repack1-2build2, 4.5.3+repack1-1build1, 4.5.3+repack1-1build2, 4.7.5+repack1-1build2, 4.7.5+repack1-1ubuntu1, 4.7.5+repack1-1ubuntu3, 4.7.5+repack1-1ubuntu4, 4.7.5+repack1-1ubuntu5, 4.7.5+repack1-1ubuntu6, 4.7.5+repack1-1ubuntu7, 4.9.7+repack1-1, 4.9.7+repack1-1.1, 4.9.7+repack1-1.1build1, 4.9.7+repack1-1.1build2, 4.9.7+repack1-1build1
- Fixed versions
- 0.9.13+dfsg-3ubuntu0.1, 0.9.14+dfsg-1ubuntu0.1, 0.9.15+dfsg-1ubuntu0.1
- CVEs
- CVE-2026-32853
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:59 UTC · Revision 1
Source evidence
LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.
osv:UBUNTU-CVE-2026-32853
tightvnc
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: Not specified
vino
Fixed versions: Not specified
italc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: Not specified
vino
Fixed versions: Not specified
italc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: Not specified
vino
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: 0.9.13+dfsg-3ubuntu0.1
tightvnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
vino
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: 0.9.14+dfsg-1ubuntu0.1
tightvnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
vino
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
libvncserver
Fixed versions: 0.9.15+dfsg-1ubuntu0.1
tightvnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
vino
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
tightvnc
Fixed versions: Not specified
veyon
Fixed versions: Not specified
x11vnc
Fixed versions: Not specified
Complete source record
{
"id": "494f2a4603f91607bfd0125727451c2888da49a016485f4c5b078dde5d07709b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-32853",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-32853",
"summary": "LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.",
"evidence": "osv:UBUNTU-CVE-2026-32853",
"products": [
{
"name": {
"value": "tightvnc",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.9-6.4",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.9-6.4ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.9-6.5+deb8u1build0.14.04.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-1.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.10+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3build1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.3",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.4",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.5",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10+dfsg-3ubuntu0.16.04.6",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "vino",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.8.1-0ubuntu6",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu7",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu8",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu9",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu9.1",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu9.2",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu9.3",
"evidence": "/affected/3/versions"
},
{
"value": "3.8.1-0ubuntu9.4",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "italc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.0.2+dfsg1-3",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.0.2+dfsg1-4",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.0.2+dfsg1-4ubuntu0.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.10-0ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "1.3.10-0ubuntu3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-1.2build1",
"evidence": "/affected/6/versions"
},
{
"value": "0.9.13-1.2ubuntu0.1~esm1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.11+dfsg-1",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.1",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.2",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.3",
"evidence": "/affected/7/versions"
},
{
"value": "0.9.11+dfsg-1ubuntu1.4",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "vino",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.8.1-0ubuntu12",
"evidence": "/affected/8/versions"
},
{
"value": "3.22.0-2ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "3.22.0-3ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "3.22.0-3ubuntu1.1",
"evidence": "/affected/8/versions"
},
{
"value": "3.22.0-3ubuntu1.2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "italc",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:3.0.3+dfsg1-1",
"evidence": "/affected/9/versions"
},
{
"value": "1:3.0.3+dfsg1-2",
"evidence": "/affected/9/versions"
},
{
"value": "1:3.0.3+dfsg1-2build1",
"evidence": "/affected/9/versions"
},
{
"value": "1:3.0.3+dfsg1-2ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "1:3.0.3+dfsg1-3",
"evidence": "/affected/9/versions"
},
{
"value": "1:3.0.3+dfsg1-3ubuntu0.1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.10-0ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "1.3.10-0ubuntu4",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-2",
"evidence": "/affected/11/versions"
},
{
"value": "0.9.13-2build1",
"evidence": "/affected/11/versions"
},
{
"value": "0.9.13-3",
"evidence": "/affected/11/versions"
},
{
"value": "0.9.13-3ubuntu0.1~esm1",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.11+dfsg-1.3",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-3ubuntu3",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-6",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-7",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-8",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-9",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-9ubuntu0.1",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-9ubuntu0.2",
"evidence": "/affected/12/versions"
},
{
"value": "0.9.12+dfsg-9ubuntu0.3",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "vino",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.22.0-5ubuntu2",
"evidence": "/affected/13/versions"
},
{
"value": "3.22.0-5ubuntu2.1",
"evidence": "/affected/13/versions"
},
{
"value": "3.22.0-5ubuntu2.2",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.10-0ubuntu5",
"evidence": "/affected/14/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.4+repack1-2",
"evidence": "/affected/15/versions"
},
{
"value": "4.2.5+repack1-1",
"evidence": "/affected/15/versions"
},
{
"value": "4.3.1+repack1-1",
"evidence": "/affected/15/versions"
},
{
"value": "4.3.1+repack1-2",
"evidence": "/affected/15/versions"
},
{
"value": "4.3.1+repack1-2build1",
"evidence": "/affected/15/versions"
},
{
"value": "4.3.1+repack1-2build2",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.13-6",
"evidence": "/affected/16/versions"
},
{
"value": "0.9.16-3",
"evidence": "/affected/16/versions"
},
{
"value": "0.9.16-3ubuntu0.1~esm1",
"evidence": "/affected/16/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.13+dfsg-3ubuntu0.1",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": [
{
"value": "0.9.13+dfsg-3",
"evidence": "/affected/17/versions"
},
{
"value": "0.9.13+dfsg-3build1",
"evidence": "/affected/17/versions"
},
{
"value": "0.9.13+dfsg-3build2",
"evidence": "/affected/17/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-3",
"evidence": "/affected/18/versions"
},
{
"value": "1:1.3.10-5",
"evidence": "/affected/18/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.5.3+repack1-1build1",
"evidence": "/affected/19/versions"
},
{
"value": "4.5.3+repack1-1build2",
"evidence": "/affected/19/versions"
}
]
},
{
"name": {
"value": "vino",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.22.0-6ubuntu3",
"evidence": "/affected/20/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/21/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.16-7",
"evidence": "/affected/21/versions"
},
{
"value": "0.9.16-7build1",
"evidence": "/affected/21/versions"
},
{
"value": "0.9.16-8",
"evidence": "/affected/21/versions"
}
]
},
{
"name": {
"value": "libvncserver",
"evidence": "/affected/22/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.14+dfsg-1ubuntu0.1",
"evidence": "/affected/22/ranges"
}
],
"affected_versions": [
{
"value": "0.9.14+dfsg-1",
"evidence": "/affected/22/versions"
},
{
"value": "0.9.14+dfsg-1build1",
"evidence": "/affected/22/versions"
},
{
"value": "0.9.14+dfsg-1build2",
"evidence": "/affected/22/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/23/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-7",
"evidence": "/affected/23/versions"
},
{
"value": "1:1.3.10-7build1",
"evidence": "/affected/23/versions"
},
{
"value": "1:1.3.10-7build2",
"evidence": "/affected/23/versions"
},
{
"value": "1:1.3.10-8",
"evidence": "/affected/23/versions"
}
]
},
{
"name": {
"value": "veyon",
"evidence": "/affected/24/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.7.5+repack1-1build2",
"evidence": "/affected/24/versions"
},
{
"value": "4.7.5+repack1-1ubuntu1",
"evidence": "/affected/24/versions"
},
{
"value": "4.7.5+repack1-1ubuntu3",
"evidence": "/affected/24/versions"
},
{
"value": "4.7.5+repack1-1ubuntu4",
"evidence": "/affected/24/versions"
},
{
"value": "4.7.5+repack1-1ubuntu5",
"evidence": "/affected/24/versions"
}
]
},
{
"name": {
"value": "vino",
"evidence": "/affected/25/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.22.0-6ubuntu3",
"evidence": "/affected/25/versions"
},
{
"value": "3.22.0-6ubuntu4",
"evidence": "/affected/25/versions"
},
{
"value": "3.22.0-6ubuntu5",
"evidence": "/affected/25/versions"
}
]
},
{
"name": {
"value": "x11vnc",
"evidence": "/affected/26/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.16-9",
"evidence": "/affected/26/versions"
},
{
"value": "0.9.16-9ubuntu1",
"evidence": "/affected/26/versions"
},
{
"value": "0.9.16-10",
"evidence": "/affected/26/versions"
}
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],
"modified": "2026-10-17T12:59:59.388316479Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-32853",
"https://www.cve.org/CVERecord?id=CVE-2026-32853",
"https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj",
"https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read",
"https://ubuntu.com/security/notices/USN-8463-1"
]
},
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{
"value": "CVE-2026-32853",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360069,
"published_at": "2026-03-24T18:16:00+00:00"
}