Vulnerability in Surrealdb
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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
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:N/A:L.
EPSS exploit prediction
EPSS: 0.003 (19.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Surrealdb — versions 0, 3.1.0
Weakness classification (CWE)
References
- github.com/surrealdb/surrealdb/security/advisories/GHSA-fwg2-gr34-q3w8 (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/surrealdb-before-algorithm-downgrade-via-es512 (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-63761?
- CVE-2026-63761 is a medium-severity vulnerability in Surrealdb, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.3/10. Published 2026-07-20.
- How severe is CVE-2026-63761?
- Medium severity. CVSS v3 base score is 4.3 out of 10.