CVEvulnerability
CVE-2026-21717
5.9 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-03-30
- Last modified
- 2026-08-19
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.0 ([email protected])
- 5.9 MEDIUM — CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-328
Description
A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value, making hash collisions trivially predictable. By crafting a request that causes many such collisions in V8's internal string table, an attacker can significantly degrade performance of the Node.js process.
The most common trigger is any endpoint that calls `JSON.parse()` on attacker-controlled input, as JSON parsing automatically internalizes short strings into the affected hash table.
This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.
Affected configurations
• nodejs node.js (<= 20.20.1)
• nodejs node.js (>= 22.0.0 <= 22.22.1)
• nodejs node.js (>= 24.0.0 <= 24.14.0)
• nodejs node.js (>= 25.0.0 <= 25.8.1)
Related
Weakness · CWE (1)
- CWE-328 Use of Weak Hash weakness