CVE-2026-21717

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 packages (4)

• Alpine/nodejsfrom 0, < 22.22.2-r0
• Bitnami/nodefrom 0, < 20.20.2, >= 21.0.0, < 22.22.2, >= 23.0.0, < 24.14.1, >= 25.0.0, < 25.8.2
• Bitnami/node-minfrom 0, < 20.20.2, >= 21.0.0, < 22.22.2, >= 23.0.0, < 24.14.1, >= 25.0.0, < 25.8.2
• Debian/nodejsfrom 0

CVSS scores

References (4)

• ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2026-21717
• ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-21717
• WEBhttps://nodejs.org/en/blog/vulnerability/march-2026-security-releases
• WEBhttps://nvd.nist.gov/vuln/detail/CVE-2026-21717