{"id":"CVE-2025-30204","aliases":["GHSA-mh63-6h87-95cp","GO-2025-3553"],"url":"https://o3.security/vulnerability/CVE-2025-30204","summary":"jwt-go allows excessive memory allocation during header parsing","details":"golang-jwt is a Go implementation of JSON Web Tokens. Starting in version 3.2.0 and prior to versions 5.2.2 and 4.5.2, the function parse.ParseUnverified splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request whose Authorization header consists of Bearer  followed by many period characters, a call to that function incurs allocations to the tune of O(n) bytes (where n stands for the length of the function's argument), with a constant factor of about 16. This issue is fixed in 5.2.2 and 4.5.2.","published":"2025-03-21T21:42:01.382Z","modified":"2026-08-12T03:51:24.826201873Z","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":{"score":0.00723,"percentile":0.52369,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/golang-jwt/jwt/v5","fixedVersion":"5.2.2"},{"ecosystem":"Go","name":"github.com/golang-jwt/jwt/v4","fixedVersion":"4.5.2"},{"ecosystem":"Go","name":"github.com/golang-jwt/jwt","fixedVersion":null}],"fix":{"url":"https://github.com/golang-jwt/jwt/commit/0951d184286dece21f73c85673fd308786ffe9c3","label":"golang-jwt/jwt@0951d18"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/30xxx/CVE-2025-30204.json"},{"type":"ADVISORY","url":"https://github.com/golang-jwt/jwt/security/advisories/GHSA-mh63-6h87-95cp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30204"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20250404-0002/"},{"type":"FIX","url":"https://github.com/golang-jwt/jwt/commit/0951d184286dece21f73c85673fd308786ffe9c3"},{"type":"FIX","url":"https://github.com/golang-jwt/jwt/commit/bf316c48137a1212f8d0af9288cc9ce8e59f1afb"},{"type":"PACKAGE","url":"https://github.com/golang-jwt/jwt"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20250404-0002"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:24.826201873Z"}}