CVE-2026-107275

@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.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://cna.openjsf.org/security-advisories.html
https://github.com/fastify/fastify-jwt/security/advisories/GHSA-9x4w-r9p5-5h7m

Configurations

No configuration.

History

08 Oct 2026, 12:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-08 12:17

Updated : 2026-10-08 20:49

NVD link : CVE-2026-107275

Mitre link : CVE-2026-107275

CVE.ORG link : CVE-2026-107275

JSON object : View

Products Affected

No product.

CWE

CWE-390

Detection of Error Condition Without Action

CWE-613

Insufficient Session Expiration

CWE-754

Improper Check for Unusual or Exceptional Conditions

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