{"id":"CVE-2026-33204","aliases":["GHSA-xw36-67f8-339x"],"url":"https://o3.security/vulnerability/CVE-2026-33204","summary":"SimpleJWT has an Unauthenticated Denial of Service via JWE header tampering","details":"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.","published":"2026-03-20T22:37:13.411Z","modified":"2026-08-05T03:47:27.049025909Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"kelvinmo/simplejwt","fixedVersion":"1.1.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/kelvinmo/simplejwt/releases/tag/v1.1.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33204.json"},{"type":"ADVISORY","url":"https://github.com/kelvinmo/simplejwt/security/advisories/GHSA-xw36-67f8-339x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33204"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:47:27.049025909Z"}}