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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nodejs | node | 20.20.1 – ≤ 20.20.1, 22.22.1 – ≤ 22.22.1, 24.14.0 – ≤ 24.14.0, 25.8.1 – ≤ 25.8.1, 4.0 – < 4.*, 5.0 – < 5.*, 6.0 – < 6.*, 7.0 – < 7.*, 8.0 – < 8.*, 9.0 – < 9.*, 10.0 – < 10.*, 11.0 – < 11.*, 12.0 – < 12.*, 13.0 – < 13.*, 14.0 – < 14.*, 15.0 – < 15.*, 16.0 – < 16.*, 17.0 – < 17.*, 18.0 – < 18.*, 19.0… | 4.* |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nodejs | 22.22.2+dfsg+~cs22.19.15-1 | — |
| Debian 13 | nodejs | 20.19.2+dfsg-1+deb13u2 | DSA-6183-1 |
| Debian 12 | nodejs | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nodejs | No fix yet | — |
| Ubuntu 26.04 LTS | nodejs | No fix yet | — |
| Ubuntu 25.10 | nodejs | No fix yet | — |
| Ubuntu 24.04 LTS | nodejs | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 20.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 18.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 16.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 14.04 LTS | nodejs | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | nodejs24 +4 | 1:24.14.1-2.el10_1 | RHSA-2026:7675 |
| RHEL 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 | RHSA-2026:7675 |
| RHEL 9 | nodejs +4 | 1:24.14.1-2.module+el9.7.0+24166+51c9666b | RHSA-2026:7350 |
| RHEL 9 | nodejs-nodemon | 3.0.3-3.module+el9.7.0+24166+51c9666b | RHSA-2026:7350 |
| RHEL 9 | nodejs-packaging +1 | 2021.06-6.module+el9.7.0+24166+51c9666b | RHSA-2026:7350 |
| RHEL 9 | npm | 1:11.11.0-1.24.14.1.2.module+el9.7.0+24166+51c9666b | RHSA-2026:7350 |
| RHEL 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+24166+51c9666b | RHSA-2026:7350 |
| RHEL 8 | nodejs +4 | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 | RHSA-2026:7670 |
| RHEL 8 | nodejs-nodemon | 3.0.3-1.module+el8.10.0+24190+49a46c75 | RHSA-2026:7670 |
| RHEL 8 | nodejs-packaging +1 | 2021.06-6.module+el8.10.0+24190+49a46c75 | RHSA-2026:7670 |
| RHEL 8 | npm | 1:11.11.0-1.24.14.1.2.module+el8.10.0+24190+49a46c75 | RHSA-2026:7670 |
| RHEL 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+24190+49a46c75 | RHSA-2026:7670 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | nodejs20 +6 | 20.20.0-7.1.hum1 | RHSA-2026:7386 |
| Red Hat Hardened Images 1 | nodejs20-npm | 10.8.2-1.20.20.0.7.1.hum1 | RHSA-2026:7386 |
| Red Hat Hardened Images 1 | nodejs22 +6 | 22.22.0-1.3.hum1 | RHSA-2026:7387 |
| Red Hat Hardened Images 1 | nodejs22-npm | 10.9.4-1.22.22.0.1.3.hum1 | RHSA-2026:7387 |
| Red Hat Hardened Images 1 | nodejs24 +6 | 24.14.1-4.hum1 | RHSA-2026:6402 |
| Red Hat Hardened Images 1 | nodejs24-npm | 11.11.0-1.24.14.1.4.hum1 | RHSA-2026:6402 |
| Red Hat Hardened Images 1 | nodejs25 +6 | 25.9.0-1.hum1 | RHSA-2026:6431 |
| Red Hat Hardened Images 1 | nodejs25-npm | 11.12.1-1.25.9.0.1.hum1 | RHSA-2026:6431 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | nodejs24-docs | 1:24.14.1-2.el10_1 | ALSA-2026:7675 |
| AlmaLinux 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 | ALSA-2026:7675 |
| AlmaLinux 9 | nodejs +4 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux 9 | nodejs-nodemon | 3.0.3-3.module_el9.7.0+209+ecf6523e | ALSA-2026:7350 |
| AlmaLinux 9 | nodejs-packaging | 2021.06-6.module_el9.7.0+209+ecf6523e | ALSA-2026:7350 |
| AlmaLinux 9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+198+8bf605ba | ALSA-2026:7350 |
| AlmaLinux 9 | npm | 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux 8 | nodejs +4 | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux 8 | nodejs-nodemon | 3.0.3-1.module_el8.10.0+4061+f8ceeab9 | ALSA-2026:7670 |
| AlmaLinux 8 | nodejs-packaging +1 | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:7670 |
| AlmaLinux 8 | npm | 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
| AlmaLinux 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | nodejs24 | 1:24.14.1-2.el10_1 | RLSA-2026:7675 |
| Rocky Linux 9 | nodejs-nodemon | 3.0.3-3.module+el9.7.0+40025+0e0cf6b2 | RLSA-2026:7350 |
| Rocky Linux 9 | nodejs-packaging | 2021.06-6.module+el9.7.0+40052+e32ea525 | RLSA-2026:7350 |
| Rocky Linux 8 | nodejs-nodemon | 3.0.3-1.module+el8.10.0+2084+ab509703 | RLSA-2026:7670 |
| Rocky Linux 8 | nodejs-packaging | 2021.06-6.module+el8.10.0+40048+6d99f608 | RLSA-2026:7670 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | nodejs22 | 22.22.2-150700.3.9.1 | SUSE-SU-2026:1478-1 |
| SLES 15 SP7 | nodejs24 | 24.14.1-150700.15.8.1 | SUSE-SU-2026:1299-1 |
| SLES 15 SP6 | nodejs20 | 20.20.2-150600.3.18.1 | SUSE-SU-2026:1363-1 |
| SLES 15 SP6 | nodejs22 | 22.22.2-150600.13.15.1 | SUSE-SU-2026:1509-1 |
| SLES 15 SP5 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES 15 SP5 | nodejs20 | 20.20.2-150500.11.27.1 | SUSE-SU-2026:1371-1 |
| SLES 15 SP4 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES 12 SP5 | nodejs18 | 18.20.8-8.44.1 | SUSE-SU-2026:4248-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | nodejs22 | 22.23.0-160000.1.1 | SUSE-SU-2026:22368-1 |
| SLES for SAP 16.0 | nodejs24 | 24.14.1-160000.1.1 | SUSE-SU-2026:21181-1 |
| SLES for SAP 15 SP6 | nodejs20 | 20.20.2-150600.3.18.1 | SUSE-SU-2026:1363-1 |
| SLES for SAP 15 SP6 | nodejs22 | 22.22.2-150600.13.15.1 | SUSE-SU-2026:1509-1 |
| SLES for SAP 15 SP5 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES for SAP 15 SP5 | nodejs20 | 20.20.2-150500.11.27.1 | SUSE-SU-2026:1371-1 |
| SLES for SAP 15 SP4 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES 16.0 | nodejs22 | 22.23.0-160000.1.1 | SUSE-SU-2026:22368-1 |
| SLES 16.0 | nodejs24 | 24.14.1-160000.1.1 | SUSE-SU-2026:21181-1 |
| SLE HPC 15 SP5 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLE HPC 15 SP5 | nodejs20 | 20.20.2-150500.11.27.1 | SUSE-SU-2026:1371-1 |
| SLE HPC 15 SP4 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nodejs24 | 24.14.1-1.1 | openSUSE-SU-2026:10504-1 |
| openSUSE Tumbleweed | nodejs26 | 26.3.1-1.1 | openSUSE-SU-2026:11110-1 |
| openSUSE Leap 16.0 | nodejs22 | 22.23.0-160000.1.1 | openSUSE-SU-2026:21058-1 |
| openSUSE Leap 16.0 | nodejs24 | 24.14.1-160000.1.1 | openSUSE-SU-2026:20519-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nodejs | 24.14.1-r0 | — |
| Alpine v3.23 | nodejs | 24.14.1-r0 | — |
| Alpine v3.22 | nodejs | 22.22.2-r0 | — |
| Alpine v3.21 | nodejs | 22.22.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | nodejs20 +4 | 1:20.20.2-1.amzn2023.0.1 | ALAS2023-2026-1577 |
| Amazon Linux 2023 | nodejs20-npm | 1:10.8.2-1.20.20.2.1.amzn2023.0.1 | ALAS2023-2026-1577 |
| Amazon Linux 2023 | nodejs22 +4 | 1:22.22.2-1.amzn2023.0.1 | ALAS2023-2026-1576 |
| Amazon Linux 2023 | nodejs22-npm | 1:10.9.7-1.22.22.2.1.amzn2023.0.1 | ALAS2023-2026-1576 |
| Amazon Linux 2023 | nodejs24 +4 | 1:24.14.1-1.amzn2023.0.1 | ALAS2023-2026-1578 |
| Amazon Linux 2023 | nodejs24-npm | 1:11.11.0-1.24.14.1.1.amzn2023.0.1 | ALAS2023-2026-1578 |
| Amazon Linux 2023 | v8-11.3-devel | 3:11.3.244.8-1.20.20.2.1.amzn2023.0.1 | ALAS2023-2026-1577 |
| Amazon Linux 2023 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.amzn2023.0.1 | ALAS2023-2026-1576 |
| Amazon Linux 2023 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.1.amzn2023.0.1 | ALAS2023-2026-1578 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | nodejs24 | 24.14.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | nodejs24 +4 | 1:24.14.1-2.0.2.el10_1 | ELSA-2026-7675 |
| Oracle Linux 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.0.2.el10_1 | ELSA-2026-7675 |
| Oracle Linux 9 | nodejs +4 | 1:24.14.1-2.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350 |
| Oracle Linux 9 | nodejs-nodemon | 3.0.3-3.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350 |
| Oracle Linux 9 | nodejs-packaging +1 | 2021.06-6.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350 |
| Oracle Linux 9 | npm | 1:11.11.0-1.24.14.1.2.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350 |
| Oracle Linux 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350 |
| Oracle Linux 8 | nodejs +4 | 1:24.14.1-2.module+el8.10.0+90873+35652ecc | ELSA-2026-7670 |
| Oracle Linux 8 | nodejs-nodemon | 3.0.3-1.module+el8.10.0+90873+35652ecc | ELSA-2026-7670 |
| Oracle Linux 8 | nodejs-packaging +1 | 2021.06-6.module+el8.10.0+90873+35652ecc | ELSA-2026-7670 |
| Oracle Linux 8 | npm | 1:11.11.0-1.24.14.1.2.module+el8.10.0+90873+35652ecc | ELSA-2026-7670 |
| Oracle Linux 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+90873+35652ecc | ELSA-2026-7670 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | nodejs-16 +3 | No fix yet | — |
| Wolfi rolling | nodejs-22 | 22.22.3-r0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
open-flaw/CVE-2026-21717 ★ 0 · Mar 31, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 34
- WID-SEC-2026-0843 Node.js: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- ALSA-2026:7350 Important: nodejs:24 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:7675 Important: nodejs24 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:7670 Important: nodejs:24 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:7675 Red Hat Security Advisory: nodejs24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7670 Red Hat Security Advisory: nodejs:24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7350 Red Hat Security Advisory: nodejs:24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7387 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:7386 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:6431 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:6402 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- SUSE-SU-2026:4261-1 Security update for nodejs18 SUSE / openSUSE Security Updates · Sep 18, 2026
- SUSE-SU-2026:4248-1 Security update for nodejs18 SUSE / openSUSE Security Updates · Sep 18, 2026
- SUSE-SU-2026:22368-1 Security update for nodejs22 SUSE / openSUSE Security Updates · Jul 2, 2026
- openSUSE-SU-2026:21058-1 Security update for nodejs22 SUSE / openSUSE Security Updates · Jun 30, 2026
- openSUSE-SU-2026:11110-1 nodejs26-26.3.1-1.1 on GA media SUSE / openSUSE Security Updates · Jun 24, 2026
- ELSA-2026-7675 Important: nodejs24 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 9, 2026
- openSUSE-SU-2026:20519-1 Security update for nodejs24 SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:21181-1 Security update for nodejs24 SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:1509-1 Security update for nodejs22 SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:1478-1 Security update for nodejs22 SUSE / openSUSE Security Updates · Apr 21, 2026
- SUSE-SU-2026:1363-1 Security update for nodejs20 SUSE / openSUSE Security Updates · Apr 16, 2026
- SUSE-SU-2026:1371-1 Security update for nodejs20 SUSE / openSUSE Security Updates · Apr 16, 2026
- RLSA-2026:7675 Important: nodejs24 security update Rocky Linux Security Advisories · Apr 15, 2026
- SUSE-SU-2026:1299-1 Security update for nodejs24 SUSE / openSUSE Security Updates · Apr 14, 2026
- ALAS2023-2026-1576 Important: nodejs22 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 13, 2026
- ALAS2023-2026-1577 Important: nodejs20 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 13, 2026
- ALAS2023-2026-1578 Important: nodejs24 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 13, 2026
- RLSA-2026:7670 Important: nodejs:24 security update Rocky Linux Security Advisories · Apr 13, 2026
- ELSA-2026-7670 Important: nodejs:24 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 13, 2026
- RLSA-2026:7350 Important: nodejs:24 security update Rocky Linux Security Advisories · Apr 10, 2026
- ELSA-2026-7350 Important: nodejs:24 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 10, 2026
- openSUSE-SU-2026:10504-1 corepack24-24.14.1-1.1 on GA media SUSE / openSUSE Security Updates · Apr 9, 2026
- DSA-6183-1 nodejs - security update Debian Security (DSA / DLA) · Mar 29, 2026