CVE-2026-21717
Medium · 5.9CVSS
5.9
EPSS
0.3%
Published
Mar 30, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | nodejs22 | 0 | 22.23.0-160000.1.1 |
| openSUSE:Leap 16.0 | nodejs24 | 0 | 24.14.1-160000.1.1 |
| openSUSE:Tumbleweed | nodejs24 | 0 | 24.14.1-1.1 |
| openSUSE:Tumbleweed | nodejs26 | 0 | 26.3.1-1.1 |
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