CVE-2026-21713
5.9
MEDIUM
CVSS 3.1
EPSS 0.39%
描述
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**.
如何修補 CVE-2026-21713
要修補 CVE-2026-21713,請將受影響套件升級到下列已修補版本。
- —升級至 22.22.2-r0 或更新版本
- —升級至 20.20.2 或更新版本
- —升級至 20.20.2 或更新版本
- —升級至 18.20.4+dfsg-1~deb12u2 或更新版本
CVE-2026-21713 正在被利用嗎?
低 — EPSS 為 0.4%,目前沒有觀察到大規模利用活動。
受影響套件(4)
- from 0, < 22.22.2-r0
- from 0, < 20.20.2, >= 21.0.0, < 22.22.2, >= 23.0.0, < 24.14.1, >= 25.0.0, < 25.8.2
- from 0, < 20.20.2, >= 21.0.0, < 22.22.2, >= 23.0.0, < 24.14.1, >= 25.0.0, < 25.8.2
- from 0, < 18.20.4+dfsg-1~deb12u2
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |