Description
Token validation methods are susceptible to a timing side-channel during HMAC comparison. With a large enough number of requests over a low latency connection, an attacker may use this to determine the expected HMAC.
References (3)
Core 3
Core References
Patch, Third Party Advisory
https://github.com/robbert229/jwt/commit/ca1404ee6e83fcbafb66b09ed0d543850a15b654
Issue Tracking, Third Party Advisory
https://github.com/robbert229/jwt/issues/12
Patch, Vendor Advisory
https://pkg.go.dev/vuln/GO-2020-0023
Scores
CVSS v3
7.5
EPSS
0.0075
EPSS Percentile
50.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-668
Status
published
Products (2)
json_web_token_project/json_web_token
robbert229/jwt
0 - 0.0.0-20170426191122-ca1404ee6e83Go
Published
Dec 27, 2022
Tracked Since
Feb 18, 2026