CVE-2026-12151 (GCVE-0-2026-12151)

Vulnerability from cvelistv5 – Published: 2026-06-17 16:05 – Updated: 2026-08-10 12:05
VLAI
Title
undici WebSocket client vulnerable to denial of service via fragment count bypass
Summary
Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service. Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint. All releases starting at undici 6.17.0 are affected. Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-17 17:29 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
URL Tags
https://github.com/nodejs/undici/security/advisor…
https://cna.openjsf.org/security-advisories.html
https://access.redhat.com/security/cve/CVE-2026-12151 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2489980 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:48151 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39246 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35842 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35841 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41947 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39868 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:52399 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35892 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35891 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34342 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36754 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41929 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38236 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38009 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36621 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47728 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48124 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36820 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
undici undici Affected: 0 , < 6.26.0 (semver)
Unaffected: 6.26.0 (semver)
Affected: 7.0.0 , < 7.28.0 (semver)
Unaffected: 7.28.0 (semver)
Affected: 8.0.0 , < 8.5.0 (semver)
Unaffected: 8.5.0 (semver)
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Red Hat Cryostat 4 on RHEL 9 Unaffected: 4.2.0-13 , < * (rpm)
    cpe:/a:redhat:cryostat:4::el9
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 1:24.18.0-1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 1:22.23.1-2.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 1:22.23.1-2.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260630152626.6d880403 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260703140402.6d880403 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260626074955.rhel9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260626075442.rhel9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782840519 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782839981 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782839193 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782838753 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782839279 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782840539 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782841925 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782844225 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782839658 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782838476 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782839996 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Cluster Observability Operator 1.5.0 Unaffected: 1782839494 , < * (rpm)
    cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Red Hat Developer Hub 1.10 Unaffected: 1783448184 , < * (rpm)
    cpe:/a:redhat:rhdh:1.10::el9
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Red Hat Red Hat Developer Hub 1.9 Unaffected: 1784210921 , < * (rpm)
    cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat Hardened Images Unaffected: 26.5.0-1.3.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Hardened Images Unaffected: 24.18.0-0.3.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 1783306396 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.17 Unaffected: 1784744859 , < * (rpm)
    cpe:/a:redhat:openshift:4.17::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.29 Unaffected: 1782498792 , < * (rpm)
    cpe:/a:redhat:openshift_devspaces:3.29::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.29 Unaffected: 1783007534 , < * (rpm)
    cpe:/a:redhat:openshift_devspaces:3.29::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.29 Unaffected: 1782989367 , < * (rpm)
    cpe:/a:redhat:openshift_devspaces:3.29::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.29 Unaffected: 1785245777 , < * (rpm)
    cpe:/a:redhat:openshift_devspaces:3.29::el9
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
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Red Hat Red Hat Build of Podman Desktop     cpe:/a:redhat:podman_desktop:1
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat Openshift Data Foundation 4     cpe:/a:redhat:openshift_data_foundation:4
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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Credits
lpinca Nadav0077 UlisesGascon
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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.