5.9

CVE-2026-21713

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**.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Nodejs ≫ Node.Js SwEdition - Version <= 20.20.1
Nodejs ≫ Node.Js SwEdition - Version >= 22.0.0 <= 22.22.1
Nodejs ≫ Node.Js SwEdition - Version >= 24.0.0 <= 24.14.0
Nodejs ≫ Node.Js SwEdition - Version >= 25.0.0 <= 25.8.1
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.39% 0.301
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
HackerOne 5.9 2.2 3.6
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-208 Observable Timing Discrepancy

Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
Vendor Advisory