CVE-2026-107275: @fastify/jwt

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

@fastify/jwt is a JSON Web Token plugin for the Fastify web framework. In versions before 10.2.3, a time span passed to expiresIn, notBefore, or maxAge that the plugin's parser cannot read, such as a compound span, a month unit, an ISO 8601 duration, a decimal comma, or a value with surrounding whitespace, is silently dropped instead of refused. On the signing path this produces a token with no expiration claim that never expires, and on the verification path a configured maxAge stops being enforced, so a token that should be rejected for age is accepted. The issue is fixed in @fastify/jwt 10.2.3, and users should upgrade to 10.2.3 or later. As a workaround, pass these options as a number of seconds, or verify that any time-span string parses to a finite value before relying on it.

Affected products

• @fastify/jwt @fastify/jwt: before 10.2.3 (fixed in 10.2.3)

Published 2026-10-08. Last modified 2026-10-08.