CVE-2026-33204
HIGHSimpleJWT <1.1.1 PBES2 JWE Header - Denial of Service
Title source: manualDescription
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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/kelvinmo/simplejwt/security/advisories/GHSA-xw36-67f8-339x
X_Refsource_Misc x_refsource_misc
https://github.com/kelvinmo/simplejwt/releases/tag/v1.1.1
Scores
CVSS v3
7.5
EPSS
0.0048
EPSS Percentile
37.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
Status
published
Products (2)
kelvinmo/simplejwt
< 1.1.1 (2 CPE variants)
kelvinmo/simplejwt
0 - 1.1.1Packagist
Published
Mar 20, 2026
Tracked Since
Mar 21, 2026