CVE-2026-21712

MEDIUMNVD 5.75.7—

5.7

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.

CVSS v3: 5.7
EG Score: 5.7(medium)
EPSS: 10.1%
KEV: Not listed

Published

March 30, 2026

Last Modified

May 10, 2026

Advisory Details (2)

Auto-updated May 10, 2026

No patch confirmed yet.

generic

Node.js — Tuesday, March 24, 2026 Security Releases

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

generic

HackerOne

https://hackerone.com/reports/3546390

Vendor Advisories for CVE-2026-21712(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	nodejs24-1:24.14.1-2.el10_1	2026-04-13	redhat
redhat	nodejs:24-8100020260408131901.6d880403	2026-04-13	redhat
redhat	nodejs:24-9070020260402152654.rhel9	2026-04-09	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Microsoft MSRCCVE-2026-217122026-03-31
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.

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 22:37 UTCepss_batch
2026-05-20 22:37 UTCepss_batch
2026-05-20 19:56 UTCEG score recompute
2026-05-20 19:56 UTCVendor advisory
2026-05-20 19:56 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch
2026-05-20 11:21 UTCepss_batch
2026-05-20 11:21 UTCepss_batch
2026-05-18 21:31 UTCepss_batch

Frequently asked(5)

What is CVE-2026-21712?

CVE-2026-21712 is a medium vulnerability published on March 30, 2026. 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.

When was CVE-2026-21712 disclosed?

CVE-2026-21712 was first published in the National Vulnerability Database on March 30, 2026, with the most recent update on May 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-21712 actively exploited?

CVE-2026-21712 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-21712?

CVE-2026-21712 has a CVSS v3 base score of 5.7 (NVD).

How do I remediate CVE-2026-21712?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21712, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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