CVE-2026-33204 — SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering
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 PB…
Published: 2026-03-20 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7