@fastify/jwt vulnerable to missing token expiration when temporal options cannot be parsed
@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.
CVE-2026-107275
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-107275
@fastify/jwt
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "@fastify/jwt",
"product": "@fastify/jwt",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "10.2.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "10.2.3",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/@fastify/jwt",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-107275
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12547 · Revision 1
- Added to Heist Feed
- Publisher date