# CVE-2026-21712: A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.

CVE-2026-21712 is fixed in 21 products on 2 platforms, first by RHSA-2026:7670, released March 12, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-21712
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 30, 2026
- Weakness: Improper Input Validation
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21712

## Description

A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Node.js | 25.8.2 | [Node.js 25.8.2](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs-25.8.2.md) | Mar 24, 2026 |
| Windows apps | Node.js (LTS) | 24.14.1 | [Node.js (LTS) 24.14.1](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.lts-24.14.1.md) | Mar 24, 2026 |
| Linux | nodejs RHEL 8 | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs RHEL 9 | 1:24.14.1-2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs almalinux 8 | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs almalinux 9 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs ol 8 | 1:24.14.1-2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs ol 9 | 1:24.14.1-2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-devel RHEL 8 | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-devel RHEL 9 | 1:24.14.1-2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-devel almalinux 8 | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-devel almalinux 9 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-devel ol 8 | 1:24.14.1-2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-devel ol 9 | 1:24.14.1-2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-docs RHEL 8 | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-docs RHEL 9 | 1:24.14.1-2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-docs almalinux 8 | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-docs almalinux 9 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-docs ol 8 | 1:24.14.1-2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-docs ol 9 | 1:24.14.1-2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-full-i18n RHEL 8 | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-full-i18n RHEL 9 | 1:24.14.1-2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-full-i18n almalinux 8 | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-full-i18n almalinux 9 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-full-i18n ol 8 | 1:24.14.1-2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-full-i18n ol 9 | 1:24.14.1-2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-libs RHEL 8 | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-libs RHEL 9 | 1:24.14.1-2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-libs almalinux 8 | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-libs almalinux 9 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-libs ol 8 | 1:24.14.1-2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-libs ol 9 | 1:24.14.1-2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-nodemon RHEL 8 | 0:3.0.3-1.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-nodemon RHEL 9 | 0:3.0.3-3.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-nodemon almalinux 8 | 3.0.3-1.module_el8.10.0+4061+f8ceeab9 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-nodemon almalinux 9 | 3.0.3-3.module_el9.7.0+209+ecf6523e | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-nodemon ol 8 | 0:3.0.3-1.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-nodemon ol 9 | 0:3.0.3-3.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-nodemon rocky 8 | 0:3.0.3-1.module+el8.10.0+2084+ab509703 | [RLSA-2026:7670](https://patchblox.com/security/data/fix/linux/rlsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-nodemon rocky 9 | 0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2 | [RLSA-2026:7350](https://patchblox.com/security/data/fix/linux/rlsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-packaging RHEL 8 | 0:2021.06-6.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-packaging RHEL 9 | 0:2021.06-6.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-packaging almalinux 8 | 2021.06-6.module_el8.10.0+4086+70facd4a | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-packaging almalinux 9 | 2021.06-6.module_el9.7.0+209+ecf6523e | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-packaging ol 8 | 0:2021.06-6.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-packaging ol 9 | 0:2021.06-6.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-packaging rocky 8 | 0:2021.06-6.module+el8.10.0+40048+6d99f608 | [RLSA-2026:7670](https://patchblox.com/security/data/fix/linux/rlsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-packaging rocky 9 | 0:2021.06-6.module+el9.7.0+40052+e32ea525 | [RLSA-2026:7350](https://patchblox.com/security/data/fix/linux/rlsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs-packaging-bundler RHEL 8 | 0:2021.06-6.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | nodejs-packaging-bundler RHEL 9 | 0:2021.06-6.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | nodejs-packaging-bundler almalinux 8 | 2021.06-6.module_el8.10.0+4086+70facd4a | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-packaging-bundler almalinux 9 | 2021.06-6.module_el9.7.0+198+8bf605ba | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | nodejs-packaging-bundler ol 8 | 0:2021.06-6.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | nodejs-packaging-bundler ol 9 | 0:2021.06-6.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | nodejs24 RHEL 10 | 24.14.1-2.el10_1 | [RHSA-2026:7675](https://patchblox.com/security/data/fix/linux/rhsa-2026-7675.md) | Mar 12, 2026 |
| Linux | nodejs24 amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24 ol 10 | 1:24.14.1-2.0.2.el10_1 | [ELSA-2026-7675](https://patchblox.com/security/data/fix/linux/elsa-2026-7675.md) | Jun 9, 2026 |
| Linux | nodejs24 opensuse-leap 16.0 | 24.14.1-160000.1.1 | [OPENSUSE-SU-2026:20519-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20519-1.md) | Apr 13, 2026 |
| Linux | nodejs24 rocky 10 | 1:24.14.1-2.el10_1 | [RLSA-2026:7675](https://patchblox.com/security/data/fix/linux/rlsa-2026-7675.md) | Apr 15, 2026 |
| Linux | nodejs24 sles 15.7 | 24.14.1-150700.15.8.1 | [SUSE-SU-2026:1299-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1299-1.md) | Apr 13, 2026 |
| Linux | nodejs24 sles 16.0 | 24.14.1-160000.1.1 | [SUSE-SU-2026:21181-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-21181-1.md) | Apr 13, 2026 |
| Linux | nodejs24-debuginfo amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-debugsource amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-devel amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-devel ol 10 | 1:24.14.1-2.0.2.el10_1 | [ELSA-2026-7675](https://patchblox.com/security/data/fix/linux/elsa-2026-7675.md) | Jun 9, 2026 |
| Linux | nodejs24-docs almalinux 10 | 1:24.14.1-2.el10_1 | [ALSA-2026:7675](https://patchblox.com/security/data/fix/linux/alsa-2026-7675.md) | Apr 13, 2026 |
| Linux | nodejs24-docs amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-docs ol 10 | 1:24.14.1-2.0.2.el10_1 | [ELSA-2026-7675](https://patchblox.com/security/data/fix/linux/elsa-2026-7675.md) | Jun 9, 2026 |
| Linux | nodejs24-full-i18n amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-full-i18n ol 10 | 1:24.14.1-2.0.2.el10_1 | [ELSA-2026-7675](https://patchblox.com/security/data/fix/linux/elsa-2026-7675.md) | Jun 9, 2026 |
| Linux | nodejs24-libs amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-libs ol 10 | 1:24.14.1-2.0.2.el10_1 | [ELSA-2026-7675](https://patchblox.com/security/data/fix/linux/elsa-2026-7675.md) | Jun 9, 2026 |
| Linux | nodejs24-libs-debuginfo amzn 2023 | 1:24.14.1-1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-npm almalinux 10 | 1:11.11.0-1.24.14.1.2.el10_1 | [ALSA-2026:7675](https://patchblox.com/security/data/fix/linux/alsa-2026-7675.md) | Apr 13, 2026 |
| Linux | nodejs24-npm amzn 2023 | 1:11.11.0-1.24.14.1.1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | nodejs24-npm ol 10 | 1:11.11.0-1.24.14.1.2.0.2.el10_1 | [ELSA-2026-7675](https://patchblox.com/security/data/fix/linux/elsa-2026-7675.md) | Jun 9, 2026 |
| Linux | npm RHEL 8 | 1:11.11.0-1.24.14.1.2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | npm RHEL 9 | 1:11.11.0-1.24.14.1.2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | npm almalinux 8 | 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | npm almalinux 9 | 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | npm ol 8 | 1:11.11.0-1.24.14.1.2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | npm ol 9 | 1:11.11.0-1.24.14.1.2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |
| Linux | v8-13.6-devel RHEL 8 | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+24190+49a46c75 | [RHSA-2026:7670](https://patchblox.com/security/data/fix/linux/rhsa-2026-7670.md) | Mar 12, 2026 |
| Linux | v8-13.6-devel RHEL 9 | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+24166+51c9666b | [RHSA-2026:7350](https://patchblox.com/security/data/fix/linux/rhsa-2026-7350.md) | Mar 12, 2026 |
| Linux | v8-13.6-devel almalinux 8 | 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | [ALSA-2026:7670](https://patchblox.com/security/data/fix/linux/alsa-2026-7670.md) | Apr 13, 2026 |
| Linux | v8-13.6-devel almalinux 9 | 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | [ALSA-2026:7350](https://patchblox.com/security/data/fix/linux/alsa-2026-7350.md) | Apr 9, 2026 |
| Linux | v8-13.6-devel amzn 2023 | 3:13.6.233.17-1.24.14.1.1.amzn2023.0.1 | [ALAS2023-2026-1578](https://patchblox.com/security/data/fix/linux/alas2023-2026-1578.md) | Apr 13, 2026 |
| Linux | v8-13.6-devel ol 8 | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+90873+35652ecc | [ELSA-2026-7670](https://patchblox.com/security/data/fix/linux/elsa-2026-7670.md) | Apr 13, 2026 |
| Linux | v8-13.6-devel ol 9 | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+90866+5a953a4c | [ELSA-2026-7350](https://patchblox.com/security/data/fix/linux/elsa-2026-7350.md) | Apr 10, 2026 |

---

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