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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2025-30204

jwt-go allows excessive memory allocation during header parsing

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

golang-jwt jwt

  • >= 3.2.0, < 4.5.2affected
  • >= 5.0.0-rc.1, < 5.2.2affected

References