CVE search · CVE-2026-21717
CVE-2026-21717
medium 5.9
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**.
Details
- Status
- Analyzed
- Published
- Last changed
- Source
- support@hackerone.com
- Weakness
- CWE-328
Severity
| Version | Score | Vector | Source |
|---|---|---|---|
| CVSS 3.1 | medium 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
nvd@nist.govPrimary |
| CVSS 3.0 | medium 5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
support@hackerone.comSecondary |
Affected products
Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.
- nodejs · node.js