--- id: CVE-2026-12151 title: >- undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames (CVE-2026-12151) summary: >- A flaw was found in undici. A malicious WebSocket server can exploit this by streaming numerous small or empty continuation frames. This can bypass per-frame and cumulative-size validation, leading to unbounded memory growth in the client … severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cvssSource: vendor cwe: - CWE-770 - CWE-400 vendor: Red Hat product: Red Hat Openshift Data Foundation 4.20 affected: - openshift_pipelines - build_of_podman_desktop - hardened_images - openshift_ai_rhoai - self_service_automation_portal 2 - cryostat_4_on_rhel 9 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - cluster_observability_operator 1.5.0 - amq_broker 7.13.6 - amq_broker 7.14.1 - developer_hub 1.10 - developer_hub 1.9 - openshift_ai 2.25 - openshift_ai 3.4 - openshift_container_platform 4.16 - openshift_container_platform 4.17 - openshift_dev_spaces 3.29 - openshift_dev_spaces 3.30 - openshift_data_foundation 4.18 - openshift_data_foundation 4.19 - openshift_data_foundation 4.20 patched: - cryostat_4_on_rhel 9 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - cluster_observability_operator 1.5.0 - amq_broker 7.13.6 - amq_broker 7.14.1 - developer_hub 1.10 - developer_hub 1.9 - hardened_images - openshift_ai 2.25 - openshift_ai 3.4 - openshift_container_platform 4.16 - openshift_container_platform 4.17 - openshift_dev_spaces 3.29 - openshift_dev_spaces 3.30 - openshift_data_foundation 4.18 - openshift_data_foundation 4.19 - openshift_data_foundation 4.20 published: '2026-06-17' updated: '2026-09-18' sourceUpdated: '2026-09-18T13:15:41+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12151.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12151.json - url: 'https://access.redhat.com/security/cve/CVE-2026-12151' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2489980' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-12151' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12151' - url: 'https://cna.openjsf.org/security-advisories.html' - url: 'https://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q' - url: 'https://access.redhat.com/errata/RHSA-2026:48151' - url: 'https://access.redhat.com/errata/RHSA-2026:39246' - url: 'https://access.redhat.com/errata/RHSA-2026:35842' - url: 'https://access.redhat.com/errata/RHSA-2026:35841' - url: 'https://access.redhat.com/errata/RHSA-2026:41947' - url: 'https://access.redhat.com/errata/RHSA-2026:39868' - url: 'https://access.redhat.com/errata/RHSA-2026:52399' - url: 'https://access.redhat.com/errata/RHSA-2026:35892' - url: 'https://access.redhat.com/errata/RHSA-2026:35891' - url: 'https://access.redhat.com/errata/RHSA-2026:34342' - url: 'https://access.redhat.com/errata/RHSA-2026:66545' - url: 'https://access.redhat.com/errata/RHSA-2026:66488' - url: 'https://access.redhat.com/errata/RHSA-2026:36754' - url: 'https://access.redhat.com/errata/RHSA-2026:41929' - url: 'https://access.redhat.com/errata/RHSA-2026:38236' - url: 'https://access.redhat.com/errata/RHSA-2026:38009' - url: 'https://access.redhat.com/errata/RHSA-2026:65126' - url: 'https://access.redhat.com/errata/RHSA-2026:60520' - url: 'https://access.redhat.com/errata/RHSA-2026:36621' - url: 'https://access.redhat.com/errata/RHSA-2026:47728' - url: 'https://access.redhat.com/errata/RHSA-2026:48124' - url: 'https://access.redhat.com/errata/RHSA-2026:36820' - url: 'https://access.redhat.com/errata/RHSA-2026:62260' - url: 'https://access.redhat.com/errata/RHSA-2026:56366' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:56431' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:57013' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://github.com/advisories/GHSA-vxpw-j846-p89q' tags: - csaf - vex - red-hat - cve.org - nvd - ghsa - npm epss: 0.00789 epssPercentile: 0.54353 ecosystem: npm ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-06-17T17:29:57.305732Z' ingestedAt: '2026-06-22T15:59:08.195Z' --- ## Overview A flaw was found in undici. A malicious WebSocket server can exploit this by streaming numerous small or empty continuation frames. This can bypass per-frame and cumulative-size validation, leading to unbounded memory growth in the client process. The primary consequence is memory exhaustion, resulting in a denial of service (DoS) for affected applications using the undici WebSocket client or WebSocketStream API. ## Vendor advisories - **RHSA-2026:48151** · Red Hat · fixed in: Cryostat 4 on RHEL 9 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:48151) - **RHSA-2026:39246** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-07-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:39246) - **RHSA-2026:35842** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:35842) - **RHSA-2026:35841** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:35841) - **RHSA-2026:41947** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41947) - **RHSA-2026:39868** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:39868) - **RHSA-2026:52399** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-08-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:52399) - **RHSA-2026:35892** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:35892) - **RHSA-2026:35891** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:35891) - **RHSA-2026:34342** · Red Hat · fixed in: Cluster Observability Operator 1.5.0 · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:34342) - **RHSA-2026:66545** · Red Hat · fixed in: Red Hat AMQ Broker 7.13.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66545) - **Red Hat VEX** · Important · affected: OpenShift Pipelines, Red Hat Build of Podman Desktop, Red Hat Hardened Images, Red Hat OpenShift AI (RHOAI), Self-service automation portal 2 · no fix planned: Red Hat Hardened Images, OpenShift Pipelines, Red Hat Build of Podman Desktop, Red Hat OpenShift AI (RHOAI), … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12151.json) - **RHSA-2026:36754** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36754) **undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames** — rated Important by Red Hat. Released 2026-06-17, updated 2026-09-18. Affected: - OpenShift Pipelines - Red Hat Build of Podman Desktop - Red Hat Hardened Images - Red Hat OpenShift AI (RHOAI) - Self-service automation portal 2 Fixed: - Cryostat 4 on RHEL 9 - Red Hat Enterprise Linux AppStream EUS (v. 10.0) - Red Hat Enterprise Linux AppStream (v. 10) - Red Hat Enterprise Linux AppStream (v. 8) - Red Hat Enterprise Linux AppStream EUS (v.9.6) - Red Hat Enterprise Linux AppStream (v. 9) - Cluster Observability Operator 1.5.0 - Red Hat AMQ Broker 7.13.6 - Red Hat AMQ Broker 7.14.1 - Red Hat Developer Hub 1.10 - Red Hat Developer Hub 1.9 - Red Hat Hardened Images - Red Hat OpenShift AI 2.25 - Red Hat OpenShift AI 3.4 - Red Hat OpenShift Container Platform 4.16 - Red Hat OpenShift Container Platform 4.17 - Red Hat OpenShift Dev Spaces 3.29 - Red Hat OpenShift Dev Spaces 3.30 - Red Hat Openshift Data Foundation 4.18 - Red Hat Openshift Data Foundation 4.19 - Red Hat Openshift Data Foundation 4.20 No fix planned: - Red Hat Hardened Images - OpenShift Pipelines - Red Hat Build of Podman Desktop - Red Hat OpenShift AI (RHOAI) - Self-service automation portal 2 Not affected: - Cryostat 4 on RHEL 9 - Cluster Observability Operator 1.5.0 - Red Hat Developer Hub 1.10 - Red Hat Developer Hub 1.9 - Red Hat OpenShift AI 2.25 - Red Hat OpenShift AI 3.4 - Red Hat OpenShift Container Platform 4.16 - Red Hat OpenShift Container Platform 4.17 - Red Hat OpenShift Dev Spaces 3.29 - Red Hat OpenShift Dev Spaces 3.30 ## Remediation Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:48151 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:39246 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:35842 Workarounds / mitigations: - Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. ## Package advisory (CVE-2026-12151) Affected packages: - `undici < 6.27.0` - `undici >= 7.0.0, < 7.28.0` - `undici >= 8.0.0, < 8.5.0` Patched in: - `undici 6.27.0` - `undici 7.28.0` - `undici 8.5.0` Source: https://github.com/advisories/GHSA-vxpw-j846-p89q