What is CVE-2026-18638?

CVE-2026-18638 is a medium-severity vulnerability in Rapid7 Velociraptor, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-08-11.

How severe is CVE-2026-18638?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Rapid7 Velociraptor

CVE-2026-18638

Any authenticated Velociraptor user — including one holding only the readerrole — can terminate the entire server process with a single request, by calling SetPassword with a username that does not exist.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Rapid7 Velociraptor — versions 0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference
CWE-703

References

cve@rapid7.com

Frequently asked questions

What is CVE-2026-18638?: CVE-2026-18638 is a medium-severity vulnerability in Rapid7 Velociraptor, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-08-11.
How severe is CVE-2026-18638?: Medium severity. CVSS v3 base score is 6.5 out of 10.