Velociraptor Prefetch parser out of bounds

Answer in brief

CVE-2026-77797 records a Low severity (CVSS 3.6) vulnerability in Velociraptor Prefetch parser out of bounds. The current sources do not mark it as known exploited. The current feed maps Rapid7/Velociraptor (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 24, 2026First seen by HOL Sep 24, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 3.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 3.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Rapid7/Velociraptor (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Rapid7/Velociraptorgeneric	>=0 <0.77.3	0.77.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Rapid7/Velociraptor.
Review the reported fix. Source-reported workaround: 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.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 24, 2026

Sources and claim methodology

Upstream source description

Velociraptor's prefetch library contains an out of bound vulnerability which may cause a crash when parsing certain malformed prefetch files.

Quoted source text, attributed separately from HOL analysis.