What is CVE-2026-121421?

CVE-2026-121421 is a medium-severity vulnerability in Surrealdb, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-11-03.

How severe is CVE-2026-121421?

Medium severity. CVSS v3 base score is 4.3 out of 10.

SSRF in Surrealdb

CVE-2026-121421

SurrealDB 3.1.0 before 3.3.0 contains a server-side request forgery vulnerability in network-capability matching because port-specific --deny-net rules (HOST:PORT or IP:PORT) match only a literal host string, while the resolved-IP check discards the port. Authenticated users can call http::* functions with a hostname resolving to a denied IP, or the IP of a denied hostname, to reach blocked internal services.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Surrealdb

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/surrealdb/surrealdb/security/advisories/GHSA-mhv5-88p6-w4c3 (vendor-advisory)
github.com/surrealdb/surrealdb/commit/9d9a5b0693e499e0d030cac6b618062ec02cd2bc (patch)
www.vulncheck.com/advisories/surrealdb-3.1.0-before-3.3.0-ssrf-via-port-specifi… (third-party-advisory)

Frequently asked questions

What is CVE-2026-121421?: CVE-2026-121421 is a medium-severity vulnerability in Surrealdb, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-11-03.
How severe is CVE-2026-121421?: Medium severity. CVSS v3 base score is 4.3 out of 10.