AIKIDO-2026-10527
jsrsasign is vulnerable to Observable Timing Discrepancy
24
Low Risk
This Affects:
jsrsasignTL;DR
Observable timing discrepancies in HMAC-based JSON Web Signature verification in jsrsasign allowed signature comparisons to be performed using direct string equality rather than a constant-time routine. An attacker able to measure verification response times repeatedly could potentially infer valid signature bytes and forge HMAC-signed JWS tokens. Successful exploitation could result in authentication bypass, token forgery, or unauthorized access to protected resources relying on affected HS* signature verification paths.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
jsrsasign is vulnerable to Observable Timing Discrepancy in versions 4.10.0 - 11.1.2.
How to fix this
Upgrade the jsrsasign library to the patch version.
Are You Affected?
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