CVE-2026-33204
SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 20, 2026
- Updated
- Mar 24, 2026
- Reserved
- Mar 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
simplejwtkelvinmo |
|
References
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