CVE-2016-7037: The verify function in Encryption/Symmetric.php in Malcolm Fell jwt before 1.0.3 does not use a timing-safe...

Security readout for executives and security teams

CVE-2016-7037 affects the Malcolm Fell emarref/jwt library before 1.0.3. Its signature check was not timing-safe, meaning an attacker might infer whether parts of a signature are correct and eventually spoof a JWT signature if conditions allow. Exposure is likely limited to applications that use emarref/jwt before 1.0.3 for JWT validation, especially internet-facing authentication or API flows where attackers can repeatedly observe verification timing. Treat as a focused authentication-library remediation, not a broad emergency. Prioritize systems where JWTs protect customer, administrative, or API access, because successful signature spoofing could bypass trust controls. Mitigation focus: Upgrade emarref/jwt to version 1.0.3 or later.; Check the GitHub release and vendor guidance for upgrade details.; Inventory direct and transitive uses of the vulnerable library..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.