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CVE-2026-18500— @fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key

Quick assessment

Affected
@fastify/jwt @fastify/jwt
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fastify @fastify/jwt是Fastify组织的一个JWT认证库。 Fastify @fastify/jwt 10.2.2之前版本存在加密问题漏洞，该漏洞源于请求验证密钥被插件全局配置的密钥覆盖，可能导致普通认证用户跨基于密钥的信任边界。

CVSS 8.1 · High EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
@fastify/jwt @fastify/jwt < 10.2.2 affected
10.2.2 unaffected
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I. Basic Information for CVE-2026-18500

Vulnerability Information
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Vulnerability Title
@fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key
Source: CVE Program / CVE List V5
Vulnerability Description
@fastify/jwt is a JSON Web Token plugin for Fastify. In versions before 10.2.2, a per-request verification key passed to request.jwtVerify({ key }) is silently overridden by the plugin's globally configured secret, because the option merge applies the global key last. Applications that use different keys for different authorization domains, for example separate user and admin keys, therefore accept a token signed with the global key on a route that explicitly requires another key. This lets an ordinary authenticated user cross a key-based trust boundary without knowing either secret. The issue is fixed in @fastify/jwt 10.2.2, where an explicit per-call key takes precedence over the global secret. Users should upgrade to 10.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify @fastify/jwt 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify @fastify/jwt是Fastify组织的一个JWT认证库。 Fastify @fastify/jwt 10.2.2之前版本存在加密问题漏洞，该漏洞源于请求验证密钥被插件全局配置的密钥覆盖，可能导致普通认证用户跨基于密钥的信任边界。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
@fastify/jwt @fastify/jwt 0 ~ 10.2.2 -

II. Public POCs for CVE-2026-18500

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8439 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-18500

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Vendor Advisories for CVE-2026-18500 (1)

IV. Related Vulnerabilities

Same weakness: CWE-347

V. Comments for CVE-2026-18500

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