World-accessible IPC shared memory with predictable name in TightVNC Server
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.
CVE-2026-107612
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-107612
TightVNC
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "GlavSoft",
"modules": [
"TightVNC Server (desktop server IPC)"
],
"product": "TightVNC",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.8.88",
"versionType": "custom"
}
],
"platforms": [
"Windows"
],
"programFiles": [
"SharedMemory.cpp",
"DesktopServerWatcher.cpp"
],
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "DesktopServerWatcher::execute()"
}
]
}
]- Related CVEs
- CVE-2026-107612
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12510 · Revision 1
- Added to Heist Feed
- Publisher date