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.
References (4)
Scores
CVSS v3
7.5
EPSS
0.0011
EPSS Percentile
29.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-405
Status
published
Products (5)
golang-jwt/jwt
0 - 4.5.2Go
golang-jwt/jwt
3.2.0Go
golang-jwt/jwt
5.0.0-rc.1 - 5.2.2Go
golang-jwt/jwt
>= 3.2.0, < 4.5.2
golang-jwt/jwt
>= 5.0.0-rc.1, < 5.2.2
Published
Mar 21, 2025
Tracked Since
Feb 18, 2026