How severe is CVE-2026-21712?

CVE-2026-21712 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-21712 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21712?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21712 have an EU (EUVD) identifier?

Yes. CVE-2026-21712 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17093.

When was CVE-2026-21712 published?

CVE-2026-21712 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-21712

CVE-2026-21712 is a medium-severity vulnerability with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.7)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17093
Weakness: CWE-20
Published: 2026-03-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-21712?: CVE-2026-21712 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-21712 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21712?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21712 have an EU (EUVD) identifier?: Yes. CVE-2026-21712 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17093.
When was CVE-2026-21712 published?: CVE-2026-21712 was published on 2026-03-30 and last updated on 2026-06-17.

References

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