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@fastify/jwt vulnerable to missing token expiration when temporal options cannot be parsed

Type: advisorySource: Official CVE List1 source record

@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.

Announced Source revision 1
Original source ↗

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
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