Fixed
Created: Mar 31, 2026
Updated: May 11, 2026
Resolved Date: May 7, 2026
Found In Version: 10.25.33.2
Fix Version: 10.25.33.9
Severity: Standard
Applicable for: Wind River Linux LTS 25
Component/s: Userspace
A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values. Node.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision. This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.
