Vulnerability in Nodejs Node

CVE-2026-21717

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…

EPSS: 0.000 (9.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-21717?
CVE-2026-21717 is a medium-severity vulnerability in Nodejs Node, classified under Use of Weak Hash. CVSS score: 5.9/10. Published 2026-03-30.
How severe is CVE-2026-21717?
Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2026-21717 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.