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Full vulnerability report · 2026
CVE-2026-21712High confidence

nodejs node: Improper Input Validation

nodejs · node

6.5MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.32% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs nodejs node and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

6 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainnodejsVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.24.14.1-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourcenodejsNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcenodejsNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcenodejsNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcenodejsNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivenodejsUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-21712 · CSAF 2.0 · revision 3 · finalRed Hat Product SecurityNode.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing
47 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • nodejs as a component of Red Hat Enterprise Linux 10
  • nodejs-devel as a component of Red Hat Enterprise Linux 10
  • nodejs-docs as a component of Red Hat Enterprise Linux 10
  • nodejs-full-i18n as a component of Red Hat Enterprise Linux 10
  • nodejs-libs as a component of Red Hat Enterprise Linux 10
  • nodejs-npm as a component of Red Hat Enterprise Linux 10
  • nodejs22.src as a component of Red Hat Enterprise Linux 10
  • nodejs-devel (nodejs:20) as a component of Red Hat Enterprise Linux 8
  • nodejs-devel (nodejs:22) as a component of Red Hat Enterprise Linux 8
  • nodejs-docs (nodejs:20) as a component of Red Hat Enterprise Linux 8
  • nodejs-docs (nodejs:22) as a component of Red Hat Enterprise Linux 8
  • nodejs-full-i18n (nodejs:20) as a component of Red Hat Enterprise Linux 8
Summary
A flaw was found in Node.js. This vulnerability allows an attacker to cause a Denial of Service (DoS) by providing a malformed Internationalized Domain Name (IDN) to the `url.format()` function. When processed, this malformed input triggers an internal error, causing the Node.js application to crash. This can disrupt services and make them unavailable.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-17093

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

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.

What

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.

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may disrupt the affected service.

What

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.

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Input Validation → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-20 ↗

CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-20
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-0843Node.js: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Node.js ausnutzen, um einen Denial of Service zu verursachen, Sicherheitsmaßnahmen zu umgehen und Informationen offenzulegen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260401Security Bulletin 01 Apr 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 01 Apr 2026, published on 1 April 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0627Multiples vulnérabilités dans les produits Splunk

Record?id=CVE-2026-1584 Référence CVE CVE-2026-1605 https://www.cve.org/CVERecord?id=CVE-2026-1605 Référence CVE CVE-2026-1861 https://www.cve.org/CVERecord?id=CVE-2026-1861 Référence CVE CVE-2026-20238 https://www.cve.org/CVERecord?id=CVE-2026-20238 Référence CVE CVE-2026-20239 https://www.cve.org/CVERecord?id=CVE-2026-20239 Référence CVE CVE-2026-20240 https://www.cve.org/CVERecord?id=CVE-2026-20240 Référence CVE CVE-2026-21441 https://www.cve.org/CVERecord?id=CVE-2026-21441 Référence CVE CVE-2026-21637 https://www.cve.org/CVERecord?id=CVE-2026-21637 Référence CVE CVE-2026-21710 https://www.cve.org/CVERecord?id=CVE-2026-21710 Référence CVE CVE-2026-21712 https://www.cve.org/CVERecord?id=CVE-2026-21712 Référence CVE CVE-2026-21713 https://www.cve.org/CVERecord?id=CVE-2026-21713 Référence CVE CVE-2026-21714 https://www.cve.org/CVERecord?id=CVE-2026-21714 Référence CVE CVE-2026-21715 https://www.cve.org/CVERecord?id=CVE-2026-21715 Référence CVE CVE-2026-21716 https://www.cve.org/CVERecord?id=CVE-2026-21716 Référence CVE CVE-2026-21717 https://www.cve.org/CVERecord?id=CVE-2026-21717 Référence CVE CVE-2026-21925 https://www.cve.org/CVERecord?id=CVE-2026-21925 Référence CVE CVE-2026-21932 https://www.cve.org/CVERecord?id=CVE-2026-21932 Référence CVE CVE-2026-21933 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0414Multiples vulnérabilités dans les produits Microsoft

De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-029196Node.js FoundationのNode.jsにおける入力確認に関する脆弱性

Node.jsのURL処理に欠陥があり、無効な文字を含む不正な国際化ドメイン名（IDN）で`url.format()`が呼び出されると、ネイティブコードでアサーション失敗が発生してNode.jsプロセスがクラッシュします。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 30 Mar 2026 · Last source change 10 May 2026, 13:16 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-17093
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCISA ADP
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    24.14.0 ≤ 24.14.0; 25.8.1 ≤ 25.8.1 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    24.14.0 ≤ 24.14.0; 25.8.1 ≤ 25.8.1 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: nodejs.org/march-2026-security-releases.
    Before
    no authoritative guidance recorded
    After
    vendor advisory: nodejs.org/march-2026-security-releases
    support@hackerone.com ↗
  4. CVSS scoreCVSS score changed from 5.7 (CVSS 3.0 · CNA · CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H) to 6.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
    Before
    5.7 (CVSS 3.0 · CNA · CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H)
    After
    6.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
    NIST NVD ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-17093↗Red Hat Product Security security advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-21712 · cve.blacktree.nl