CVE-2026-33204CWE-400

SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering

High · published March 20, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
45.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00559 · 45.8th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-03-20T22:37Z
EPSS history
Timeline
  • 20 MAR 22:37Z
    SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering
    cvelistv5