CVE-2025-71390: SurrealDB before 2.3.6 deny-net Bypass via DNS Resolution

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-18 · updated 2026-09-29
Weakness: CWE-863

Description

SurrealDB before 2.2.6, 2.3.6, and 2.1.8 (and 3.0.0-alpha.7 and earlier) fails to validate DNS-resolved hostnames against --deny-net network access restrictions in its http::* functions. An authenticated user can invoke http::<fn>(<url>) with a hostname that resolves to a denied IP address, causing the server to issue the request anyway and return the response. This bypasses network access controls, allowing access to restricted internal endpoints and potentially retrieving or altering sensitive information and credentials, depending on the deployment.

Affected products

surrealdb: before 2.1.8; from 2.2.0 before 2.2.6; from 2.3.0 before 2.3.6; 3.0.0-alpha1, 3.0.0-alpha2, 3.0.0-alpha3, 3.0.0-alpha4, 3.0.0-alpha5, 3.0.0-alpha6 (+1) — fixed in 2.1.8, 2.2.6, 2.3.6

How to fix

Upgrade to a fixed version: surrealdb 2.1.8, 2.2.6, 2.3.6. Check the vendor advisory for mitigations.

References

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