# CVE-2026-121421: SurrealDB server-side request forgery in network deny rules

Source: https://junglewise.ai/threats/cve-2026-121421-surrealdb-3-1-0-before-3-3-0-contains-a-server-side-request  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-121421 · Severity: medium · CVSS 4.3 · Published 2026-11-03

SurrealDB is a database server that enforces network access controls to block connections to internal services. A vulnerability in the network-policy matching logic allows authenticated database users to bypass port-specific deny rules by using alternate names (hostnames or IP addresses) that resolve to the same target, enabling them to reach blocked internal services via HTTP functions.

Technologies: [Surrealdb](https://junglewise.ai/threats/technologies/surrealdb-surrealdb). Vendors: [SurrealDB](https://junglewise.ai/threats/vendors/surrealdb).

## Quick answers

**Is CVE-2026-121421 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121421 being exploited in the wild.

**How severe is CVE-2026-121421?** Medium severity, with a CVSS score of 4.3, published 3 November 2026.

**Which products and versions are affected?** Surrealdb 3.1.0 before 3.3.0.

**Is there a fix for CVE-2026-121421?** Yes: fixed in 3.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-121421 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-121421?** Check whether you run Surrealdb at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.3.0

## Technical details

Port-specific deny rules (HOST:PORT or IP:PORT) match only a literal hostname string, while the resolved-IP check discards the port and compares only IP addresses. This mismatch allows an attacker to reference a denied target using a different name that resolves to the same IP. An authenticated user calling http::* functions can bypass the deny and reach blocked services. The vulnerability affects versions 3.1.0 through 3.2.x; bare IP deny rules without ports remain robust.

## Affected products

- SurrealDB SurrealDB 3.1.0 before 3.3.0

## Timeline

- 2026-10-19: disclosed
- 2026-11-03: advisory

## References

- [https://github.com/surrealdb/surrealdb/commit/9d9a5b0693e499e0d030cac6b618062ec02cd2bc](https://github.com/surrealdb/surrealdb/commit/9d9a5b0693e499e0d030cac6b618062ec02cd2bc)
- [https://github.com/surrealdb/surrealdb/security/advisories/GHSA-mhv5-88p6-w4c3](https://github.com/surrealdb/surrealdb/security/advisories/GHSA-mhv5-88p6-w4c3)

## Related threats

- [SurrealDB unbounded recursion in value serialization](https://junglewise.ai/threats/cve-2026-121423-surrealdb-before-3-3-0-contains-an-unbounded-recursion)
- [SurrealDB server-side request forgery in JWKS URL validation](https://junglewise.ai/threats/cve-2026-121422-surrealdb-from-3-1-0-before-3-3-0-contains-a-server-side-request)
- [SurrealDB MCP session hijack via BoundSubject fingerprint collision](https://junglewise.ai/threats/cve-2026-121419-surrealdb-from-3-1-0-before-3-3-0-contains-an-improper)
- [SurrealDB authorization bypass via streaming index planner](https://junglewise.ai/threats/cve-2026-121418-surrealdb-from-3-1-0-before-3-3-0-contains-an-incorrect)
- [SurrealDB deny-funcs capability bypass via method-style invocations](https://junglewise.ai/threats/cve-2026-121416-surrealdb-2-0-0-before-3-3-1-does-not-enforce-deny-funcs)