Vulnerability · Published Jul 20, 2026 · Assigned by VulnCheck
CVE-2026-63761SurrealDB before 3.1.0 Algorithm Downgrade via ES512
Medium 4.3
In plain English
A medium-severity broken cryptography in surrealdb from surrealdb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).
Official description
SurrealDB before 3.1.0 silently substitutes the ES384 algorithm when a JWT access method is configured with ALGORITHM ES512 (DEFINE ACCESS ... TYPE JWT ALGORITHM ES512), because the underlying jsonwebtoken crate (v10.x) has no ES512 variant and the mapping defaults to ES384 without any error, warning, or log message. Users who supply the correct P-521 key for ES512 experience authentication handshake failures due to the curve mismatch with ES384 (which expects P-384), and tokens are rejected by external systems expecting genuine ES512 signatures. The flaw cannot be used to forge tokens or compromise data confidentiality or integrity, as ES384 remains cryptographically strong.
Affected products (as reported)
Weakness: CWE-327 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
References
- GitHub Security Advisory (GHSA-fwg2-gr34-q3w8) vendor-advisory
- VulnCheck Advisory: SurrealDB before 3.1.0 Algorithm Downgrade via ES512 third-party-advisory