CVE-2026-21712: nodejs node Improper Input Validation
Vulnerability summary
CVE-2026-21712 is a medium (CVSS 6.5) Improper Input Validation vulnerability in nodejs node. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 26.4% of scored vulnerabilities.
Not severe (CVSS 5.7, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 5Timeline
- 30-03-2026PublishedVulnerability first disclosed.
- 10-05-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.7MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
- NVDNIST5.7MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
26%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.32% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- nodejs< 24.14.1-r0
Debian1 product
- nodejsAll versions (No fix recorded)
Ubuntu1 product
- nodejsAll versions (No fix recorded)
4 vendors · 5 products
