HighCVE-2026-76646

    Apache MyFaces: Uncontrolled Resource Consumption (CVE-2026-76646)

    Published Sources: BSI

    Share

    What is affected, what to do

    A remote attacker could cause excessive resource consumption by supplying specially crafted request parameters, potentially resulting in a denial of service condition. Older unsupported versions may also be affected.

    Update Apache MyFaces to version 2.3.12, websphere_application_server to version 26.0.0.11, App Connect Enterprise to version 12.0.12.30.

    Affected
    • Apache MyFaces lte 2.2.0-beta..2.2.15
    • Apache MyFaces eq 2.3.0..2.3.0
    • Apache MyFaces lte 2.3-next-M1..2.3-next-M8
    • Apache MyFaces lte 2.3.1..2.3.11
    • Apache MyFaces lte 3.0.0..3.0.3
    • Apache MyFaces lte 4.0.0..4.0.3
    • Apache MyFaces lte 4.1.0..4.1.3

    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: Vendor (CNA), CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: BSI

    0.6 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 48.0

    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
    76.92 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
    0.6 %
    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
    48.0
    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: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 17 September 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-400

    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 remote attacker could cause excessive resource consumption by supplying specially crafted request parameters, potentially resulting in a denial of service condition. Older unsupported versions may also be affected. Users are recommended to upgrade to versions 2.3.12, 2.3-next-M9, 3.0.4, 4.0.4, or 4.1.4, which fix this issue.

    Source: BSI WID Portal

    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
    Apache Software FoundationApache MyFaces
    • 2.2.0-beta – ≤ 2.2.15
    • 2.3.0
    • 2.3.1 – ≤ 2.3.11
    • 2.3.1 – < 2.3.12
    • 2.3-next-M1 – ≤ 2.3-next-M8
    • 2.3-next-M1 – < 2.3-next-M9
    • 3.0.0 – ≤ 3.0.3
    • 3.0.0 – < 3.0.4
    • 4.0.0 – ≤ 4.0.3
    • 4.0.0 – < 4.0.4
    • 4.1.0 – ≤ 4.1.3
    • 4.1.0 – < 4.1.4
    • —
    • —
    • —
    • 2.3.12
    • —
    • 2.3-next-M9
    • —
    • 3.0.4
    • —
    • 4.0.4
    • —
    • 4.1.4
    IBMWebSphere Application Server
    • 8.5
    • 9.0
    • < 8.5.5.32
    • < 9.0.5.30
    • —
    • —
    • 8.5.5.32
    • 9.0.5.30
    IBMWebSphere Application Server - Liberty
    • 17.0.0.3 – ≤ 26.0.0.10
    • 20.0.0.12 – ≤ 26.0.0.10
    • —
    • —
    nodecajs-yaml
    • ≥ 3.0.0, < 3.15.2
    • —
    ibmwebsphere_application_server
    • 17.0.0.3 – < 26.0.0.11
    • 20.0.0.12 – < 26.0.0.11
    • 26.0.0.11
    • 26.0.0.11
    IBMApp Connect Enterprise
    • < 12.0.12.30
    • < 13.0.9.0
    • 12.0.12.30
    • 13.0.9.0
    IBMWebSphere Application Server Liberty
    • < 26.0.0.11
    • 26.0.0.11
    From bundled advisories, not CVE-specific (12)

    Product list of a bundled advisory that does not state which product this CVE affects.

    Products from bundled advisories
    Affected versionsFixed in
    AtlassianBamboo LTS
    • < 10.2.24
    • < 12.1.12
    • 10.2.24
    • 12.1.12
    AtlassianBitbucket
    • < 10.5.1
    • 10.5.1
    AtlassianBitbucket LTS
    • < 10.2.8
    • < 9.4.26
    • 10.2.8
    • 9.4.26
    AtlassianConfluence
    • < 11.0.0
    • 11.0.0
    AtlassianConfluence LTS
    • < 10.2.19
    • < 9.2.26
    • 10.2.19
    • 9.2.26
    AtlassianCrucible
    • < 4.9.15
    • 4.9.15
    AtlassianFisheye
    • < 4.9.15
    • 4.9.15
    AtlassianJira LTS
    • < 10.3.26
    • < 11.3.12
    • 10.3.26
    • 11.3.12

    Vendors and products

    Weakness classes (CWE)

    • CWE-400Uncontrolled Resource Consumption

      Class

      The product does not properly control the allocation and maintenance of a limited resource.

      Entry at MITRE CWE-400

    References & sources

    • ibm.comsupport/pages/node/7292236Vendor advisory, Patch, Vendor advisory
    • ibm.comsupport/pages/node/7292228Vendor advisory, Patch, Vendor advisory
    • ibm.comsupport/pages/node/7292226Vendor advisory, Patch
    • ibm.comsupport/pages/node/7292232Vendor advisory, Patch, Vendor advisory
    • github.comnodeca/js-yaml/security/advisories/GHSA-2883-xcg3-v3hhx_refsource_CONFIRM
    • github.comnodeca/js-yaml/pull/797x_refsource_MISC
    • github.comnodeca/js-yaml/commit/3485bc06ff8a0251505f44a00414d90df2466639x_refsource_MISC
    • github.comnodeca/js-yaml/commit/6a8e05f9a485188ed730ac81e81ae221352ef480x_refsource_MISC
    • github.comnodeca/js-yaml/commit/d90b6612a5a84385bdcb556c44578eac76dc0f6bx_refsource_MISC
    • github.comnodeca/js-yaml/releases/tag/3.15.2x_refsource_MISC
    • github.comnodeca/js-yaml/releases/tag/4.3.2x_refsource_MISC
    • NVD (NIST)vuln/detail/CVE-2026-84375advisory
    • github.comnodeca/js-yamlpackage
    • github.comnodeca/js-yaml/releases/tag/5.4.1x_refsource_MISC
    • ibm.comsupport/pages/node/7292235Vendor advisory, Patch
    • ibm.comsupport/pages/node/7292221Vendor advisory, Patch
    • lists.apache.orgthread/q8zxrdhbmmx8ofgr9s7ymnqo8l2x8oy9Vendor advisory
    • openwall.comlists/oss-security/2026/09/16/12
    • lists.apache.orgthread/4kwh2dys1sdcm3o4pbk41t2lt9or72qqVendor advisory
    • openwall.comlists/oss-security/2026/09/16/13

    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 modifiedCISA ADP

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

      CISA assessment (SSVC): exploitation: none known, automatable: yes

      Show 2 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
      SSVC assessmentadded
      —
      {"id":"CVE-2026-76646","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-17T19:13:43.042483Z"}

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

    2. Record modifiedCVE Program

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      http://www.openwall.com/lists/oss-security/2026/09/16/12

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. ReceivedApache

      Weakness type: CWE-400

      Description added or changed

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      A remote attacker could cause excessive resource consumption by supplying specially crafted request parameters, potentially resulting in a denial of service condition. Older unsupported versions may also be affected. Users are recommended to upgrade to versions 2.3.12, 2.3-next-M9, 3.0.4, 4.0.4, or 4.1.4, which fix this issue.
      Weakness type (CWE)added
      —
      CWE-400
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/76xxx/CVE-2026-76646.json">CVE-2026-76646</a>
      Referenceadded
      —
      https://lists.apache.org/thread/q8zxrdhbmmx8ofgr9s7ymnqo8l2x8oy9

      Source identifier: security@apache.org

    Linked CVEs

    Linked CVEs
    HighCVE-2026-95696IBM WebSphere Application Server Liberty Denial of Service7.5—
    CriticalCVE-2026-95695IBM WebSphere Application Server Liberty Incorrect Authorization9.1—
    CriticalCVE-2026-93909IBM WebSphere Application Server Liberty is affected by an authentication bypass9.1—
    HighCVE-2026-93905IBM WebSphere Application Server Liberty is affected by a deserialization of untrusted data8.2—
    CriticalCVE-2026-93895IBM WebSphere Application Server Liberty Improper Access Control9.1—
    HighCVE-2026-84375js-yaml: maxTotalMergeKeys does not limit CPU use for empty merge sources7.5—
    HighCVE-2026-76646Apache MyFaces: Denial of Service via Unbounded Request Parsing7.5—
    CriticalCVE-2026-68536Apache MyFaces: Server-Side Request Forgery / Local File Inclusion Vulnerability9.8—
    HighCVE-2026-105443IBM WebSphere Application Server Liberty is affected by an improper access control8.2—
    HighCVE-2026-105442IBM WebSphere Application Server: Deserialization of Untrusted Data7.5—
    HighCVE-2026-101294IBM WebSphere Application Server - Liberty: Missing Cryptographic Step8.7—
    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-76646
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-76646"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-76646.svg?lang=en" alt="CVE-2026-76646 – NEOSEC Intel" height="20"></a>