HighCVE-2026-91150

    CGI: Allocation of Resources Without Limits or Throttling (CVE-2026-91150)

    Published Sources: BSI

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    What is affected, what to do

    A flaw was found in Cockpit. This vulnerability allows a remote attacker, without prior authentication, to send specially crafted fragmented WebSocket messages.

    Update Red Hat Enterprise Linux 10 to version 0:366.1.1-1.el10_3, Red Hat Enterprise Linux 10.2 Extended Update Support to version 0:356.4.1-1.el10_2, Red Hat Enterprise Linux 8 to version 0:310.10.2-1.el8_10.

    Affected
    • Red Hat Enterprise Linux 10 lt *..0:366.1.1-1.el10_3
    • Red Hat Enterprise Linux 10.2 Extended Update Support lt *..0:356.4.1-1.el10_2
    • Red Hat Enterprise Linux 8 lt *..0:310.10.2-1.el8_10
    • Red Hat Enterprise Linux 9 lt *..0:366.1.1-1.el9_9
    • Red Hat Enterprise Linux 9.8 Extended Update Support lt *..0:356.4.1-1.el9_8
    Fixed in
    • Red Hat Enterprise Linux 10 0:366.1.1-1.el10_3
    • Red Hat Enterprise Linux 10.2 Extended Update Support 0:356.4.1-1.el10_2
    • Red Hat Enterprise Linux 8 0:310.10.2-1.el8_10
    • Red Hat Enterprise Linux 9 0:366.1.1-1.el9_9
    • Red Hat Enterprise Linux 9.8 Extended Update Support 0:356.4.1-1.el9_8

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

    Metrics

    7.5

    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: BSI

    1.1 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 66.8

    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
    84.29 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
    1.1 %
    Moderate — model estimates 1-10% 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
    66.8
    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
    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-770

    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 Cockpit. This vulnerability allows a remote attacker, without prior authentication, to send specially crafted fragmented WebSocket messages. These messages accumulate without a total-size limit, leading to unbounded memory exhaustion and a denial of service in the `cockpit-ws` service.

    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
    —CGI
    • < 5.00
    • 5.00
    c-aresc-ares
    • < 1.34.7
    • 1.34.7
    GoogleGuava
    • 4.0 – < 33.7.2
    • 33.7.2
    klauspostcompress
    • < 1.20.2
    • 1.20.2
    Red HatRed Hat Enterprise Linux 10
    • < 0:1.26.7-4.el10_3.2
    • < 0:1.26.7-5.el10_3.1
    • < 0:1.26.7-9.el10_3.1
    • < 0:366.1.1-1.el10_3
    • < 0:49.3-18.el10_3
    • < 0:49.4-6.el10_3.1
    • —
    • 0:1.26.7-4.el10_3.2
    • 0:1.26.7-5.el10_3.1
    • 0:1.26.7-9.el10_3.1
    • 0:366.1.1-1.el10_3
    • 0:49.3-18.el10_3
    • 0:49.4-6.el10_3.1
    • —
    Red HatRed Hat Enterprise Linux 10.2 Extended Update Support
    • < 0:1.26.7-2.el10_2.8
    • < 0:356.4.1-1.el10_2
    • < 0:49.3-5.el10_2
    • < 0:49.4-5.el10_2.5
    • 0:1.26.7-2.el10_2.8
    • 0:356.4.1-1.el10_2
    • 0:49.3-5.el10_2
    • 0:49.4-5.el10_2.5
    Red HatRed Hat Enterprise Linux 6
    • —
    • —
    Red HatRed Hat Enterprise Linux 7
    • —
    • —
    Red HatRed Hat Enterprise Linux 8
    • < 0:1.16.1-3.el8_10
    • < 0:1.16.1-8.el8_10
    • < 0:310.10.2-1.el8_10
    • —
    • 0:1.16.1-3.el8_10
    • 0:1.16.1-8.el8_10
    • 0:310.10.2-1.el8_10
    • —
    Red HatRed Hat Enterprise Linux 9
    • < 0:1.22.12-10.el9_9.1
    • < 0:1.22.12-3.el9_9.1
    • < 0:366.1.1-1.el9_9
    • < 0:40.0-13.el9_9
    • < 2:3.0.4-8.el9_9.6
    • —
    • 0:1.22.12-10.el9_9.1
    • 0:1.22.12-3.el9_9.1
    • 0:366.1.1-1.el9_9
    • 0:40.0-13.el9_9
    • 2:3.0.4-8.el9_9.6
    • —
    Red HatRed Hat Enterprise Linux 9.8 Extended Update Support
    • < 0:356.4.1-1.el9_8
    • < 0:40.0-13.el9_8
    • < 2:3.0.4-4.el9_8.16
    • 0:356.4.1-1.el9_8
    • 0:40.0-13.el9_8
    • 2:3.0.4-4.el9_8.16
    Red HatRed Hat OpenShift Dev Spaces
    • —
    • —
    The Tcpdump Grouplibpcap
    • < 1.10.7
    • 1.10.7
    IBMSPSS
    • < 3.4
    • < 3.5
    • < 3.6
    • < 4.0.0.0
    • 3.4
    • 3.5
    • 3.6
    • 4.0.0.0
    Red HatEnterprise Linux
    • 10
    • 10.2 Extended Update Support
    • 8
    • 9
    • 9.8 Extended Update Support
    • —
    • —
    • —
    • —
    • —
    gogithub.com/klauspost/compress
    • —
    • 1.20.2
    gogithub.com/klauspost/compress/zstd
    • <= 1.20.1
    • —
    • 1.20.2
    • 1.20.2
    mavencom.google.guava:guava
    • 10.0
    • 10.0.1
    • 10.0-rc1
    • 10.0-rc2
    • —
    • —
    • —
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianc-arestrixie
    Linuxubuntuc-aresbionic
    Linuxubuntuc-aresfocal
    Linuxubuntuc-aresjammy
    Linuxubuntuc-aresnoble
    Linuxubuntuc-aresresolute
    Linuxubuntuc-aresxenial

    Weakness classes (CWE)

    • CWE-770Allocation of Resources Without Limits or Throttling

      Base

      The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

      Entry at MITRE CWE-770

    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 modifiedRed Hat

      Show 2 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/2026/91xxx/CVE-2026-91150.json">CVE-2026-91150</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:99599

      Source identifier: secalert@redhat.com

    2. Record modifiedRed Hat

      Show 2 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/2026/91xxx/CVE-2026-91150.json">CVE-2026-91150</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:99601

      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

      Show 2 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/2026/91xxx/CVE-2026-91150.json">CVE-2026-91150</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:99602

      Source identifier: secalert@redhat.com

    4. Record modifiedRed Hat

      Show 3 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/2026/91xxx/CVE-2026-91150.json">CVE-2026-91150</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:99600
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:99603

      Source identifier: secalert@redhat.com

    5. ReceivedRed Hat

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

      Weakness type: CWE-770

      Description added or changed

      Show 8 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      A flaw was found in Cockpit. This vulnerability allows a remote attacker, without prior authentication, to send specially crafted fragmented WebSocket messages. These messages accumulate without a total-size limit, leading to unbounded memory exhaustion and a denial of service in the `cockpit-ws` service.
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-770
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/91xxx/CVE-2026-91150.json">CVE-2026-91150</a>
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-91150
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2478436
      Referenceadded
      —
      https://github.com/cockpit-project/cockpit/commit/4bc66ac3e5b4923528f1ac89517a009b7bc90f93
      Referenceadded
      —
      https://github.com/cockpit-project/cockpit/releases/tag/372

      Source identifier: secalert@redhat.com

    Linked CVEs

    Linked CVEs
    HighCVE-2026-96541Gnome-remote-desktop: gnome-remote-desktop: unauthenticated rdp sockets lack a handshake deadline7.5—
    HighCVE-2026-91151Red Hat: Link Following7.3—
    HighCVE-2026-91150Cockpit: cockpit: denial of service via unbounded fragmented websocket messages7.5—
    MediumCVE-2026-69186c-ares: Memory-amplification denial of service via unvalidated DNS header record counts5.3—
    HighCVE-2026-69184c-ares: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains7.5—
    MediumCVE-2026-6554infinte loop in libpcap before 1.10.75.5—
    HighCVE-2026-125712Gst-plugins-base: gst-plugins-base: missing bounds checks in rtcp sdes packet parsing7.5—
    HighCVE-2026-125704Gstreamer: gstreamer: use-after-free in gstreamer core buffer value deserialization7.5—
    HighCVE-2026-120650CGI: Allocation of Resources Without Limits or Throttling7.5—
    MediumCVE-2026-120642CGI versions before 5.00 for Perl return request-derived values untainted under taint mode6.5—
    CriticalCVE-2026-120641CGI: Path Traversal9.1—
    HighCVE-2026-119777Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: stack buffer overflow in h.266/vvc parser8.8—
    HighCVE-2026-119528Gimp: gimp: stack buffer overflow in psd image resource header loader7.8—
    HighCVE-2026-116591compress zstd: Panic on two-block frames——
    HighCVE-2026-109832Gnome-remote-desktop: busy-wait dos in vnc tls i/o handlers (gnutls_e_again / gnutls_e_interrupted)7.5—
    HighCVE-2026-108094Red Hat Enterprise Linux: Use After Free7.8—
    HighCVE-2026-102554Denial of Service via Eager Array Allocation During Deserialization in Guava——
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