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CVE-2026-107275— @fastify/jwt vulnerable to missing token expiration when temporal options cannot be parsed

Quick assessment

Affected
@fastify/jwt @fastify/jwt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

@fastify/jwt 是 Fastify Web 框架的一个 JSON Web Token (JWT) 插件。在版本 10.2.3 之前，如果传入 expiresIn、notBefore 或 maxAge 参数的时间跨度格式为该插件解析器无法识别（例如复合时间跨度、以月为单位的时间、ISO 8601 持续时间格式、包含小数逗号或前后带有空格的数值等），插件不会拒绝该值，而是静默地将其丢弃。在签名（生成令牌）过程中，这会导致生成的令牌不包含过期声明，从而永不过期；在验证过程中，则会导致配置的 maxAge 限制失

CVSS 6.8 · Medium EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 2

VendorProduct Version RangeStatus
@fastify/jwt @fastify/jwt < 10.2.3 affected
10.2.3 unaffected
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I. Basic Information for CVE-2026-107275

Vulnerability Information
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Vulnerability Title
@fastify/jwt vulnerable to missing token expiration when temporal options cannot be parsed
Source: CVE Program / CVE List V5
Vulnerability Description
@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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动作错误条件的检测
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
@fastify/jwt @fastify/jwt 0 ~ 10.2.3 -

II. Public POCs for CVE-2026-107275

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III. Intelligence Information for CVE-2026-107275

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Vendor Advisories for CVE-2026-107275 (1)

IV. Related Vulnerabilities

Same product: @fastify/jwt
Same vendor: @fastify/jwt
Same weakness: CWE-390

V. Comments for CVE-2026-107275

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