CVE-2026-33204

PoC —

CVSS 3.1

7.5 high

EPSS

<1%p40

Published

Mar 20, 2026 (Mar 20, 2026)

Modified

Jun 17, 2026

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.

Vendors: kelvinmo
Products: simplejwt
Weakness: CWE-400
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.5%)

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