CVE-2026-18636

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory published 2026-08-11. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The Velociraptor gRPC API has a VFSGetBuffer endpoint which allows reading files from the datastore. To prevent users from reading sensitive files or accessing other orgs, the requested path is prefix checked against a list of denied prefixes. This prefix check can be bypassed allowing a user to access usually denied files. If the user has read permission in the ROOT org, this allows access to other orgs, in which the user may not have permission.

CVSS v3
6.8
EG Score
6.8(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

CVE-2026-18636 Velociraptor VFSGetBuffer API path deny list bypass

http://docs.velociraptor.app/announcements/advisories/cve-2026-18636/

Vendor Advisories for CVE-2026-18636(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 34× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 10:32 UTCEG score recompute
  3. 2026-08-20 10:32 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 11:39 UTCEG score recompute
  6. 2026-08-19 11:39 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-18 12:45 UTCEG score recompute
  9. 2026-08-18 12:45 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 13:41 UTCEG score recompute
  12. 2026-08-17 13:41 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 14:48 UTCEG score recompute
  15. 2026-08-16 14:48 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 15:55 UTCEG score recompute
  18. 2026-08-15 15:55 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 17:01 UTCEG score recompute
  21. 2026-08-14 17:01 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 18:07 UTCGHSA enrichment
  24. 2026-08-12 19:14 UTCEG score recompute
  25. 2026-08-12 19:14 UTCGHSA enrichment
Show 9 more
  1. 2026-08-12 13:50 UTCEPSS rescore
  2. 2026-08-11 20:20 UTCEG score recompute
  3. 2026-08-11 20:20 UTCGHSA enrichment
  4. 2026-08-11 19:51 UTCEG score recompute
  5. 2026-08-11 19:51 UTCGHSA enrichment
  6. 2026-08-11 15:35 UTCEG score recompute
  7. 2026-08-11 15:35 UTCGHSA enrichment
  8. 2026-08-11 14:57 UTCEG score recompute
  9. 2026-08-11 14:56 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18636?
CVE-2026-18636 is a medium vulnerability published on August 11, 2026. The Velociraptor gRPC API has a VFSGetBuffer endpoint which allows reading files from the datastore. To prevent users from reading sensitive files or accessing other orgs, the requested path is prefix checked against a list of denied prefixes. This prefix check can be bypassed allowing a user to…
When was CVE-2026-18636 disclosed?
CVE-2026-18636 was first published in the National Vulnerability Database on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18636 actively exploited?
CVE-2026-18636 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-18636?
CVE-2026-18636 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-18636?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18636, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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