{"id":"CVE-2026-107275","title":"@fastify/jwt is a JSON Web Token plugin for the Fastify web framework","summary":"@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 8…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-390","CWE-613","CWE-754"],"vendor":"@fastify/jwt","product":"@fastify/jwt","affected":["@fastify/jwt < 10.2.3"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T12:17:14.553","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107275","references":[{"url":"https://cna.openjsf.org/security-advisories.html","label":"ce714d77-add3-4f53-aff5-83d477b104bb"},{"url":"https://github.com/fastify/fastify-jwt/security/advisories/GHSA-9x4w-r9p5-5h7m","label":"ce714d77-add3-4f53-aff5-83d477b104bb"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-08T11:31:27.692Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-08T14:21:14.347462Z"},"slug":"CVE-2026-107275","body":"## Overview\n\n@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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":37.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}