AZL-81248
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-81248.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-81248
- Upstream
- Published
- 2026-03-30T20:16:19Z
- Modified
- 2026-08-28T17:47:43Z
- Summary
- CVE-2026-21713 affecting package nodejs24 for versions less than 24.14.1-1
- Details
-
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.
- References