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OpenAdvisories
High · 7.5 CVE-2026-33204 EUVD-2026-13871GHSA-xw36-67f8-339x

SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering

Published Mar 20, 2026 · Updated Mar 24, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
kelvinmo simplejwt < 1.1.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist kelvinmo/simplejwt < 1.1.1 1.1.1 GHSA-xw36-67f8-339x

References