Unrated
Withdrawn security advisory
Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service.
- 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
Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service.
osv:UBUNTU-CVE-2026-107612
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": "57d92578aed37e4f1c77e3c88eb82c025c08e46a2542cf883fc7de5c0e7acc6d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-107612",
"method": "structured",
"payload": {
"kind": "withdrawal",
"title": "UBUNTU-CVE-2026-107612",
"summary": "Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service.",
"evidence": "osv:UBUNTU-CVE-2026-107612",
"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": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1.3.10-0ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.10-0ubuntu3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1.3.10-0ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.10-0ubuntu4",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1.3.10-0ubuntu5",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1:1.3.10-3",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.3.10-5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-7",
"evidence": "/affected/5/versions"
},
{
"value": "1:1.3.10-7build1",
"evidence": "/affected/5/versions"
},
{
"value": "1:1.3.10-7build2",
"evidence": "/affected/5/versions"
},
{
"value": "1:1.3.10-8",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "tightvnc",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.3.10-10",
"evidence": "/affected/6/versions"
},
{
"value": "1:1.3.10-10build1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-107612",
"aliases": [
"UBUNTU-CVE-2026-107612"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
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"1.3.9-6.4ubuntu1",
"1.3.9-6.5+deb8u1build0.14.04.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.3.10-0ubuntu2",
"1.3.10-0ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.10-0ubuntu3"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.10-0ubuntu3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.3.10-0ubuntu3",
"1.3.10-0ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.10-0ubuntu4"
},
{
"binary_name": "xtightvncviewer",
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}
]
}
},
{
"ranges": [
{
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}
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}
],
"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.3.10-0ubuntu5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
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"binary_name": "tightvncserver",
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},
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}
]
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},
{
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}
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"package": {
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"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:1.3.10-3",
"1:1.3.10-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncpasswd",
"binary_version": "1:1.3.10-5"
},
{
"binary_name": "tightvncserver",
"binary_version": "1:1.3.10-5"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1:1.3.10-5"
}
]
}
},
{
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"package": {
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1:1.3.10-7",
"1:1.3.10-7build1",
"1:1.3.10-7build2",
"1:1.3.10-8"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
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"binary_version": "1:1.3.10-8"
},
{
"binary_name": "tightvncserver",
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/tightvnc?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1:1.3.10-10",
"1:1.3.10-10build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107612.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncpasswd",
"binary_version": "1:1.3.10-10build1"
},
{
"binary_name": "tightvncserver",
"binary_version": "1:1.3.10-10build1"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1:1.3.10-10build1"
}
]
}
}
],
"modified": "2026-10-21T23:00:15.323062577Z",
"provider": "osv",
"upstream": [
"CVE-2026-107612"
],
"references": [
"https://ubuntu.com/security/CVE-2026-107612",
"https://www.cve.org/CVERecord?id=CVE-2026-107612",
"https://sourceforge.net/p/vnc-tight/bugs/1658/",
"https://www.tightvnc.com/whatsnew.php"
]
},
"related_cves": [
{
"value": "CVE-2026-107612",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 401026,
"published_at": "2026-10-13T00:00:00+00:00"
}