- Description
- 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**.
- Source
- support@hackerone.com
- NVD status
- Analyzed
- Products
- node.js
CVSS 3.0
- Type
- Secondary
- Base score
- 5.9
- Impact score
- 3.6
- Exploitability score
- 2.2
- Vector string
- CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Severity
- MEDIUM
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
- CWE-208
- Hype score
- Not currently trending
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