CVE-2026-63761

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.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/surrealdb/surrealdb/security/advisories/GHSA-fwg2-gr34-q3w8	Vendor Advisory Mitigation
https://www.vulncheck.com/advisories/surrealdb-before-algorithm-downgrade-via-es512	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:surrealdb:surrealdb:*:*:*:*:*:*:*:*

History

22 Jul 2026, 15:07

Type	Values Removed	Values Added
CPE		cpe:2.3:a:surrealdb:surrealdb::::::::
First Time		Surrealdb Surrealdb surrealdb
References	~~() https://github.com/surrealdb/surrealdb/security/advisories/GHSA-fwg2-gr34-q3w8 -~~	() https://github.com/surrealdb/surrealdb/security/advisories/GHSA-fwg2-gr34-q3w8 - Vendor Advisory, Mitigation
References	~~() https://www.vulncheck.com/advisories/surrealdb-before-algorithm-downgrade-via-es512 -~~	() https://www.vulncheck.com/advisories/surrealdb-before-algorithm-downgrade-via-es512 - Third Party Advisory

20 Jul 2026, 12:19

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-20 12:19

Updated : 2026-07-22 15:07

NVD link : CVE-2026-63761

Mitre link : CVE-2026-63761

CVE.ORG link : CVE-2026-63761

JSON object : View

Products Affected

surrealdb

surrealdb

CWE

CWE-327

Use of a Broken or Risky Cryptographic Algorithm

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