HighCVE-2026-32141

    flatted: Unbounded recursion DoS in parse() revive phase (CVE-2026-32141)

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

    What is affected, what to do

    A denial of service flaw has been discovered in the flatted npm library. flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process.

    Update WebReflection Flatted to version 3.4.0.

    Affected
    • WebReflection Flatted lt *..3.4.0
    Fixed in
    • WebReflection Flatted 3.4.0

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

    Metrics

    7.5

    Priority

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

    Source: NVD, CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Red Hat, Msrc Update Guide, OSV, CVE.org, BSI

    0.8 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 57.2

    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
    78.75 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
    7.5 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
    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
    0.8 %
    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
    57.2
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    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: proof of concept · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 13 March 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-674

    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 denial of service flaw has been discovered in the flatted npm library. flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process.

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

    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
    WebReflectionflatted
    • < 3.4.0
    • 3.4.0
    webreflectionflatted
    • < 3.4.0
    • 3.4.0
    IBMApp Connect Enterprise
    • < 13.0.7.0
    • < 13.2.0
    • 12.0.1.0-12.0.12.25
    • < 12.0.12.25
    • 13.0.1.0-13.0.7.1
    • 13.0.7.0
    • 13.2.0
    • —
    • 12.0.12.25
    • —
    IBMApp Connect Enterprise Certified Container Operator
    • < 12.0.24
    • 12.0.24
    SplunkSOAR
    • < 8.6.0
    • 8.6.0
    npmflatted
    • —
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-674Uncontrolled Recursion

      Class

      The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

      Entry at MITRE CWE-674

    References & sources

    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 modifiedGitHub

      Show 9 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://github.com/WebReflection/flatted/commit/7eb65d857e1a40de11c47461cdbc8541449f0606
      Referenceadded
      —
      https://github.com/WebReflection/flatted/pull/88
      Referenceadded
      —
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
      Referenceremoved
      https://github.com/WebReflection/flatted/commit/7eb65d857e1a40de11c47461cdbc8541449f0606
      —
      Referenceremoved
      https://github.com/WebReflection/flatted/pull/88
      —
      Referenceremoved
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
      —
      Reference typeremoved
      https://github.com/WebReflection/flatted/commit/7eb65d857e1a40de11c47461cdbc8541449f0606 Types: Patch
      —
      Reference typeremoved
      https://github.com/WebReflection/flatted/pull/88 Types: Issue Tracking, Patch
      —
      Reference typeremoved
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f Types: Exploit, Patch, Vendor Advisory
      —

      Source identifier: security-advisories@github.com

    2. Record modifiedCISA ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
      Referenceremoved
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
      —
      Reference typeremoved
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f Types: Exploit, Patch, Vendor Advisory
      —

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

    3. Record modifiedRed Hat ADP

      Show 23 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/2026/32xxx/CVE-2026-32141.json">CVE-2026-32141</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:13826
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:21772
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:34342
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:36651
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40118
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40945
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:5807
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:9742
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-32141
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2447083
      Referenceadded
      —
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32141.json
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:13826
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:21772
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:34342
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:36651
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:40118
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:40945
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:5807
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:9742
      —
      Referenceremoved
      https://access.redhat.com/security/cve/CVE-2026-32141
      —
      Referenceremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2447083
      —
      Referenceremoved
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32141.json
      —

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    4. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+54)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+54)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    5. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:36651
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9 (+27)
      Cluster Observability Operator 1.5.0, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9 (+27)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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