HighCVE-2026-67214

    nanoid Infinite Loop via Negative Size in non-secure module (CVE-2026-67214)

    Published Last modified Sources: Red Hat, BSI, OSV, CVE.org

    What is affected, what to do

    A flaw was found in nanoid (Nano ID), a JavaScript library used for generating unique identifiers. This vulnerability allows an attacker to cause a Denial of Service (DoS) by providing a negative size input to the customAlphabet or nanoid functions within the library's non-secure module.

    Update Nano ID project Nano ID to version 5.1.16, Nano ID project Nano ID to version 3.3.16.

    Affected
    • Nano ID project Nano ID lt *..5.1.16
    • Nano ID project Nano ID lt *..3.3.16
    Fixed in
    • Nano ID project Nano ID 5.1.16
    • Nano ID project Nano ID 3.3.16

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    8.2

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v4

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Red Hat, BSI, OSV, CVE.org

    0.3 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 26.0

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    68.33 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    8.2 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    CVSS v4

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    8.2
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.3 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    26.0
    Elevated — this CVE ranks above at least 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 29 July 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-835

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A flaw was found in nanoid (Nano ID), a JavaScript library used for generating unique identifiers. This vulnerability allows an attacker to cause a Denial of Service (DoS) by providing a negative size input to the customAlphabet or nanoid functions within the library's non-secure module. When a negative size is provided, these functions enter an infinite loop, causing the application to hang indefinitely and disrupting service availability.

    Source: redhat_csaf, BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), NVD (NIST), cvelistv5, CVE.org (MITRE)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    nanoid_projectnanoid
    • < 3.3.16
    • < 5.1.16
    • < 3.3.16
    • 4.0.0 – < 5.1.16
    • 3.3.16
    • 5.1.16
    • 3.3.16
    • 5.1.16
    IBMApp Connect Enterprise
    • < 13.0.9.0
    • < 12.0.12.30
    • 13.0.9.0
    • 12.0.12.30

    Vendors and products

    Weakness classes (CWE)

    • CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')

      Base

      The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

      Entry at MITRE CWE-835

    References & sources

    • github.comnanoid 5.1.16 release notesRelease notes, Product, Release notes
    • github.comFix commit (stop negative size from looping forever)Patch, Patch
    • vulncheck.comVulnCheck Advisory: nanoid before 5.1.16 Infinite Loop via Negative Size in non-secure moduleThird-party advisory, Patch, Release notes, Third-party advisory
    • NVD (NIST)vuln/detail/CVE-2026-67214advisory
    • github.comai/nanoid/pull/600web
    • github.comai/nanoid/pull/601web
    • github.comai/nanoid/commit/e835c9b71eab832bc6106944bdd26ea96cf2c66dweb
    • github.comai/nanoidpackage
    • github.comv3.3.16 Release NotesRelease notes, Product, Release notes

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedVulnCheck

      Show 13 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/67xxx/CVE-2026-67214.json">CVE-2026-67214</a>
      Referenceadded
      —
      https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49
      Referenceadded
      —
      https://github.com/ai/nanoid/releases/tag/3.3.16
      Referenceadded
      —
      https://github.com/ai/nanoid/releases/tag/5.1.16
      Referenceadded
      —
      https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module
      Referenceremoved
      https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49
      —
      Referenceremoved
      https://github.com/ai/nanoid/releases/tag/3.3.16
      —
      Referenceremoved
      https://github.com/ai/nanoid/releases/tag/5.1.16
      —
      Referenceremoved
      https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module
      —
      Reference typeremoved
      https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Types: Patch
      —
      Reference typeremoved
      https://github.com/ai/nanoid/releases/tag/3.3.16 Types: Product, Release Notes
      —
      Reference typeremoved
      https://github.com/ai/nanoid/releases/tag/5.1.16 Types: Product, Release Notes
      —
      Reference typeremoved
      https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Types: Patch, Release Notes, Third Party Advisory
      —

      Source identifier: disclosure@vulncheck.com

    2. Reanalysis by NVDNVD

      Product mapping changed:
      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Product configurationchanged
      OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.3.16 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 5.1.16
      OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.3.16 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 4.0.0 up to (excluding) 5.1.16

      Source identifier: nvd@nist.gov

    3. NVD analysis modifiedNVD

      Product mapping changed:
      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Product configurationchanged
      OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 5.1.16
      OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.3.16 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 5.1.16
      Reference typeadded
      —
      VulnCheck: https://github.com/ai/nanoid/releases/tag/3.3.16 Types: Product, Release Notes

      Source identifier: nvd@nist.gov

    4. Record modifiedVulnCheck

      Description added or changed

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      nanoid
      nanoid
      Descriptionchanged
      nanoid (Nano ID) before 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.
      nanoid (Nano ID) before 3.3.16 and 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.
      Referenceadded
      —
      https://github.com/ai/nanoid/releases/tag/3.3.16

      Source identifier: disclosure@vulncheck.com

    5. Initial analysis by NVDNVD

      Newly listed as affected:

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
      Product configurationadded
      —
      OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 5.1.16
      Reference typeadded
      —
      VulnCheck: https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Types: Patch
      Reference typeadded
      —
      VulnCheck: https://github.com/ai/nanoid/releases/tag/5.1.16 Types: Product, Release Notes
      Reference typeadded
      —
      VulnCheck: https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Types: Patch, Release Notes, Third Party Advisory

      Source identifier: nvd@nist.gov

    Show 2 older changes

    1. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: no

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-67214","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-07-29T14:37:09.751333Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. ReceivedVulnCheck

      CVSS V4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

      CVSS V3.1: AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

      Weakness type: CWE-835

      Description added or changed

      Show 8 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      nanoid
      Descriptionadded
      —
      nanoid (Nano ID) before 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.
      CVSSadded
      —
      AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
      CVSSadded
      —
      AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-835
      Referenceadded
      —
      https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49
      Referenceadded
      —
      https://github.com/ai/nanoid/releases/tag/5.1.16
      Referenceadded
      —
      https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module

      Source identifier: disclosure@vulncheck.com

    One NVD translation into another language is hidden.

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