CVE-2026-77797: Velociraptor Prefetch parser out of bounds
Published on 2026-09-21
Vulnogram
CVSS · LOW · 3.6 ⁄10 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Scoring scenario:
GENERAL
attackVector:
LOCAL
attackComplexity:
LOW
privilegesRequired:
NONE
userInteraction:
REQUIRED
scope:
CHANGED
confidentialityImpact:
NONE
integrityImpact:
LOW
availabilityImpact:
NONE
Description
Velociraptor's prefetch library contains an out of bound vulnerability which may cause a crash when parsing certain malformed prefetch files.
Problem
CWE-20 Improper input validation
Problem
CWE-125 Out-of-bounds read
Required configuration for exposure
This issue is only exploitable on Windows clients or offline collectors.
Workarounds
This issue can result in a client crash. Usually clients will restart after a crash and resume normal operations. Users can collect the raw prefetch files without parsing them on the client for further analysis on the server.
| Product | Affected |
|---|---|
| Rapid7 Velociraptor on
Windows
source repo Default status is unaffected |
before 0.77.3 |
Credits
- Yuval Miller and Leon Kayaliev