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CVE-2026-21717

HashDoS in V8

Severity
Medium 5.9
Published
24 Mar 2026
Last changed
19 Aug 2026
Added to UpHeron
21 Oct 2026
Fixed in
20.20.2, 22.22.2, 24.14.1, 25.8.2
Sources
NVD, nodejs

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…

Affected software

SoftwareAffected versions
Node.jsServers and applications · cpe:a:nodejs:node.js
  • From 25.0.0 up to 25.8.1
  • From 25.0.0 before 25.8.2
  • From 24.0.0 up to 24.14.0
  • From 24.0.0 before 24.14.1
All 8 release lines
  • Every version up to 20.20.1
  • From 20.0.0 before 20.20.2
  • From 22.0.0 before 22.22.2
  • From 22.0.0 up to 22.22.1
  • From 24.0.0 before 24.14.1
  • From 24.0.0 up to 24.14.0
  • From 25.0.0 before 25.8.2
  • From 25.0.0 up to 25.8.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-21717
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-21717
  • Node.js security release https://nodejs.org/en/blog/vulnerability/march-2026-security-releases