CVE-2025-30204 – jwt-go allows excessive memory allocation during header parsing

https://notcve.org/view.php?id=CVE-2025-30204

21 Mar 2025 — golang-jwt is a Go implementation of JSON Web Tokens. Prior to 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 ... • https://github.com/golang-jwt/jwt/commit/0951d184286dece21f73c85673fd308786ffe9c3 • CWE-405: Asymmetric Resource Consumption (Amplification) •