CVE-2026-33204— SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering
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I. Basic Information for CVE-2026-33204
Vulnerability Information
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Vulnerability Title
SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering
Source: NVD (National Vulnerability Database)
Vulnerability Description
SimpleJWT is a simple JSON web token library written in PHP. Prior to version 1.1.1, an unauthenticated attacker can perform a Denial of Service via JWE header tampering when PBES2 algorithms are used. Applications that call JWE::decrypt() on attacker-controlled JWEs using PBES2 algorithms are affected. This issue has been patched in version 1.1.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
SimpleJWT 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SimpleJWT是Kelvin Mo个人开发者的一个PHP语言的JSON Web Token库。 SimpleJWT 1.1.1之前版本存在资源管理错误漏洞，该漏洞源于使用PBES2算法时，未经身份验证的攻击者可通过篡改JWE标头执行拒绝服务攻击。
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
II. Public POCs for CVE-2026-33204
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- Release v1.1.1 · kelvinmo/simplejwt · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33204
IV. Related Vulnerabilities
Same weakness: CWE-400
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V. Comments for CVE-2026-33204
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