CVE-2026-21717: vulnerability facts

CVE-2026-21717

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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**.

CVSS 5.9 · Medium · EPSS 0.3% · Fix available

Published: 2026-03-30T19:07:28.415Z
Updated: 2026-05-10T13:16:01.620Z

Stack: system · node

Affected products and versions

node.js
Versions
- ≥ 20.20.1, ≤ 20.20.1: Affected (semver)
- ≥ 22.22.1, ≤ 22.22.1: Affected (semver)
- ≥ 24.14.0, ≤ 24.14.0: Affected (semver)
- ≥ 25.8.1, ≤ 25.8.1: Affected (semver)
- ≥ 4.0, < 4.*: Affected (semver)
- ≥ 5.0, < 5.*: Affected (semver)
- ≥ 6.0, < 6.*: Affected (semver)
- ≥ 7.0, < 7.*: Affected (semver)
- ≥ 8.0, < 8.*: Affected (semver)
- ≥ 9.0, < 9.*: Affected (semver)
- ≥ 10.0, < 10.*: Affected (semver)
- ≥ 11.0, < 11.*: Affected (semver)
- ≥ 12.0, < 12.*: Affected (semver)
- ≥ 13.0, < 13.*: Affected (semver)
- ≥ 14.0, < 14.*: Affected (semver)
- ≥ 15.0, < 15.*: Affected (semver)
- ≥ 16.0, < 16.*: Affected (semver)
- ≥ 17.0, < 17.*: Affected (semver)
- ≥ 18.0, < 18.*: Affected (semver)
- ≥ 19.0, < 19.*: Affected (semver)
No fix published
nodejs Debian:12
Versions
- 18.13.0+dfsg1-1
- 18.13.0+dfsg1-1.1
- 18.19.0+dfsg-1
- 18.19.0+dfsg-2
- 18.19.0+dfsg-3
- 18.19.0+dfsg-4
- 18.19.0+dfsg-5
- 18.19.0+dfsg-6
- 18.19.0+dfsg-6~deb12u1
- 18.19.0+dfsg-6~deb12u2
- 18.19.1+dfsg-1
- 18.19.1+dfsg-2
- 18.19.1+dfsg-3
- 18.19.1+dfsg-3.1
- 18.19.1+dfsg-4
- 18.19.1+dfsg-6
- 18.20.1+dfsg-1
- 18.20.1+dfsg-2
- 18.20.1+dfsg-3
- 18.20.1+dfsg-4
- 18.20.4+dfsg-1~deb12u1
- 18.20.4+dfsg-1~deb12u2
- 20.10.0+dfsg-1
- 20.12.2+dfsg-1
- 20.13.0+dfsg-1
- 20.13.1+dfsg-1
- 20.13.1+dfsg-2
- 20.14.0+dfsg-1
- 20.14.0+dfsg-2
- 20.14.0+dfsg-3
- 20.15.0+dfsg-1
- 20.15.1+dfsg-1
- 20.16.0+dfsg-1
- 20.17.0+dfsg-1
- 20.17.0+dfsg-2
- 20.18.0+dfsg-1
- 20.18.0+dfsg-2
- 20.18.1+dfsg-1
- 20.18.1+dfsg-2
- 20.18.2+dfsg-1
- 20.18.2+dfsg-2
- 20.18.2+dfsg-3
- 20.18.2+dfsg-4
- 20.18.3+dfsg-1
- 20.19.0+dfsg-1
- 20.19.0+dfsg-2
- 20.19.0+dfsg1-1
- 20.19.2+dfsg-1
- 20.19.4+dfsg-1
- 20.19.5+dfsg+~cs20.19.12-1
- 20.19.5+dfsg+~cs20.19.12-2
- 20.19.5+dfsg+~cs20.19.12-3
- 20.19.5+dfsg+~cs20.19.12-4
- 20.19.5+dfsg+~cs20.19.24-1
- 22.12.0+dfsg-1
- 22.12.0+dfsg-2
- 22.12.0+dfsg-3
- 22.14.0+dfsg-1
- 22.18.0+dfsg+~cs22.17.2-1
- 22.18.0+dfsg+~cs22.17.2-2
- 22.18.0+dfsg-1
- 22.19.0+dfsg+~cs22.18.0-1
- 22.21.1+dfsg+~cs22.19.0-1
- 22.21.1+dfsg+~cs22.19.0-2
- 22.21.1+dfsg+~cs22.19.0-3
- 22.21.1+dfsg+~cs22.19.0-4
- 22.21.1+dfsg+~cs22.19.0-5
- 22.21.1+dfsg+~cs22.19.0-6
- 22.22.0+dfsg+~cs22.19.13-1
- 22.22.0+dfsg+~cs22.19.13-2
- 22.22.0+dfsg+~cs22.19.6-1
- 22.22.1+dfsg+~cs22.19.15-1
- 22.22.2+dfsg+~cs22.19.15-1
- 22.22.2+dfsg+~cs22.19.15-3
- 24.11.1+dfsg+~cs24.10.1-1
- 24.11.1+dfsg+~cs24.10.1-2
- 24.12.0+dfsg+~cs24.10.4-1
- 24.13.0+dfsg+~cs24.10.7-1
- 24.13.0+dfsg+~cs24.10.7-2
- 24.14.0+dfsg+~cs24.12.0-1
- 24.14.0+dfsg+~cs24.12.0-2
- 24.14.1+dfsg+~cs24.12.0-1
- 24.15.0+dfsg+~cs24.12.2-1
- 24.16.0+dfsg+~cs24.13.1-1
- 24.16.0+dfsg+~cs24.13.1-2
- 24.17.0+dfsg+~cs24.13.2-1
- 24.18.0+dfsg+~cs24.13.2-1
- 24.19.0+dfsg+~cs24.13.3-1
- 24.20.0+dfsg+~cs24.13.3-1
- 24.20.0+dfsg+~cs24.13.3-2
- 24.21.0+dfsg+~cs24.13.4-1
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Debian:13
Versions
- 20.19.2+dfsg-1
- 20.19.2+dfsg-1+deb13u1
Affected ranges
- ECOSYSTEM: < 20.19.2+dfsg-1+deb13u2
Update to 20.19.2+dfsg-1+deb13u2
nodejs Debian:14
Versions
- 20.19.2+dfsg-1
- 20.19.4+dfsg-1
- 20.19.5+dfsg+~cs20.19.12-1
- 20.19.5+dfsg+~cs20.19.12-2
- 20.19.5+dfsg+~cs20.19.12-3
- 20.19.5+dfsg+~cs20.19.12-4
- 20.19.5+dfsg+~cs20.19.24-1
- 22.12.0+dfsg-1
- 22.12.0+dfsg-2
- 22.12.0+dfsg-3
- 22.14.0+dfsg-1
- 22.18.0+dfsg+~cs22.17.2-1
- 22.18.0+dfsg+~cs22.17.2-2
- 22.18.0+dfsg-1
- 22.19.0+dfsg+~cs22.18.0-1
- 22.21.1+dfsg+~cs22.19.0-1
- 22.21.1+dfsg+~cs22.19.0-2
- 22.21.1+dfsg+~cs22.19.0-3
- 22.21.1+dfsg+~cs22.19.0-4
- 22.21.1+dfsg+~cs22.19.0-5
- 22.21.1+dfsg+~cs22.19.0-6
- 22.22.0+dfsg+~cs22.19.13-1
- 22.22.0+dfsg+~cs22.19.13-2
- 22.22.0+dfsg+~cs22.19.6-1
- 22.22.1+dfsg+~cs22.19.15-1
Affected ranges
- ECOSYSTEM: < 22.22.2+dfsg+~cs22.19.15-1
Update to 22.22.2+dfsg+~cs22.19.15-1
nodejs Ubuntu:Pro:14.04:LTS
Versions
- 0.10.15~dfsg1-4
- 0.10.21~dfsg1-1
- 0.10.22~dfsg1-2
- 0.10.23~dfsg1-1
- 0.10.23~dfsg1-2
- 0.10.23~dfsg1-3
- 0.10.24~dfsg1-1
- 0.10.25~dfsg2-2
- 0.10.25~dfsg2-2ubuntu1
- 0.10.25~dfsg2-2ubuntu1.2
- 0.10.25~dfsg2-2ubuntu1.2+esm1
- 0.10.25~dfsg2-2ubuntu1.2+esm2
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:16.04:LTS
Versions
- 0.10.25~dfsg2-2ubuntu1
- 4.2.2~dfsg-1
- 4.2.3~dfsg-1
- 4.2.4~dfsg-1ubuntu1
- 4.2.4~dfsg-2
- 4.2.6~dfsg-1ubuntu1
- 4.2.6~dfsg-1ubuntu4
- 4.2.6~dfsg-1ubuntu4.1
- 4.2.6~dfsg-1ubuntu4.2
- 4.2.6~dfsg-1ubuntu4.2+esm1
- 4.2.6~dfsg-1ubuntu4.2+esm2
- 4.2.6~dfsg-1ubuntu4.2+esm3
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:18.04:LTS
Versions
- 6.11.4~dfsg-1ubuntu1
- 6.11.4~dfsg-1ubuntu2
- 6.12.0~dfsg-1ubuntu1
- 6.12.0~dfsg-2ubuntu1
- 6.12.0~dfsg-2ubuntu2
- 8.10.0~dfsg-2
- 8.10.0~dfsg-2ubuntu0.2
- 8.10.0~dfsg-2ubuntu0.3
- 8.10.0~dfsg-2ubuntu0.4
- 8.10.0~dfsg-2ubuntu0.4+esm1
- 8.10.0~dfsg-2ubuntu0.4+esm2
- 8.10.0~dfsg-2ubuntu0.4+esm3
- 8.10.0~dfsg-2ubuntu0.4+esm4
- 8.10.0~dfsg-2ubuntu0.4+esm5
- 8.10.0~dfsg-2ubuntu0.4+esm6
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:20.04:LTS
Versions
- 10.15.2~dfsg-2ubuntu1
- 10.17.0~dfsg-2ubuntu4
- 10.17.0~dfsg-2ubuntu6
- 10.19.0~dfsg-3ubuntu1
- 10.19.0~dfsg-3ubuntu1.1
- 10.19.0~dfsg-3ubuntu1.2
- 10.19.0~dfsg-3ubuntu1.3
- 10.19.0~dfsg-3ubuntu1.5
- 10.19.0~dfsg-3ubuntu1.6
- 10.19.0~dfsg-3ubuntu1.6+esm2
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:Pro:22.04:LTS
Versions
- 12.22.5~dfsg-5ubuntu1
- 12.22.7~dfsg-2ubuntu1
- 12.22.7~dfsg-2ubuntu3
- 12.22.9~dfsg-1ubuntu2
- 12.22.9~dfsg-1ubuntu3
- 12.22.9~dfsg-1ubuntu3.1
- 12.22.9~dfsg-1ubuntu3.2
- 12.22.9~dfsg-1ubuntu3.3
- 12.22.9~dfsg-1ubuntu3.4
- 12.22.9~dfsg-1ubuntu3.5
- 12.22.9~dfsg-1ubuntu3.6
- 12.22.9~dfsg-1ubuntu3.6+esm2
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:24.04:LTS
Versions
- 18.13.0+dfsg1-1ubuntu2
- 18.19.1+dfsg-2ubuntu4
- 18.19.1+dfsg-6ubuntu1
- 18.19.1+dfsg-6ubuntu2
- 18.19.1+dfsg-6ubuntu5
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:25.10
Versions
- 20.18.1+dfsg-1ubuntu2
- 20.19.2+dfsg-1
- 20.19.4+dfsg-1
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:26.10
Versions
- 22.22.1+dfsg+~cs22.19.15-1ubuntu1
- 24.16.0+dfsg+~cs24.13.1-2ubuntu1
- 24.18.0+dfsg+~cs24.13.2-1ubuntu1
- 24.19.0+dfsg+~cs24.13.3-1ubuntu1
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nodejs Ubuntu:26.04:LTS
Versions
- 20.19.4+dfsg-1
- 20.19.5+dfsg+~cs20.19.12-4
- 22.21.1+dfsg+~cs22.19.0-6ubuntu4
- 22.22.0+dfsg+~cs22.19.6-1ubuntu2
- 22.22.0+dfsg+~cs22.19.13-2ubuntu1
- 22.22.1+dfsg+~cs22.19.15-1ubuntu1
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published

Original sources

Check your server →

CVE-2026-21717

Affected products and versions

node.js

nodejs Debian:12

nodejs Debian:13

nodejs Debian:14

nodejs Ubuntu:Pro:14.04:LTS

nodejs Ubuntu:Pro:16.04:LTS

nodejs Ubuntu:Pro:18.04:LTS

nodejs Ubuntu:Pro:20.04:LTS

nodejs Ubuntu:Pro:22.04:LTS

nodejs Ubuntu:24.04:LTS

nodejs Ubuntu:25.10

nodejs Ubuntu:26.10

nodejs Ubuntu:26.04:LTS

Original sources