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CVE-2026-91150— Cockpit: cockpit: denial of service via unbounded fragmented websocket messages

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Cockpit 中发现了一个漏洞。该漏洞允许远程攻击者在无需预先认证的情况下，发送经过特殊构造的分片 WebSocket 消息。这些消息会不断累积且没有总大小限制，从而导致 服务出现无界内存耗尽，进而引发拒绝服务（DoS）攻击。

CVSS 7.5 · High

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat OpenShift Dev Spaces any affected
any affected
any affected
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I. Basic Information for CVE-2026-91150

Vulnerability Information
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Vulnerability Title
Cockpit: cockpit: denial of service via unbounded fragmented websocket messages
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/a:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/a:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/a:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Dev Spaces - cpe:/a:redhat:openshift_devspaces:3
Red Hat Red Hat OpenShift Dev Spaces - cpe:/a:redhat:openshift_devspaces:3
Red Hat Red Hat OpenShift Dev Spaces - cpe:/a:redhat:openshift_devspaces:3

II. Public POCs for CVE-2026-91150

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III. Intelligence Information for CVE-2026-91150

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Other References for CVE-2026-91150 (4)

Same Patch Batch · Red Hat · 2026-11-11 · 16 CVEs total

CVE-2026-110697 9.9 CRITICAL Quay: quay: sql like wildcard injection in robot listing leaks cross-tenant robot tokens
CVE-2026-123710 9.8 CRITICAL Quay: red hat quay: unauthenticated registry signing-key takeover via service key rotation
CVE-2026-108472 7.8 HIGH Xfsprogs: xfsprogs: local privilege escalation via command injection in xfs_admin
CVE-2026-124741 7.6 HIGH Busybox: stack buffer overflow in udhcpc6 send_d6_renew() and send_d6_release()
CVE-2026-124739 7.5 HIGH Busybox: httpd stack buffer overflow via an "i:" rule in a subdirectory httpd.conf
CVE-2026-124737 7.5 HIGH Busybox: heap buffer overflow in the tftp client on fallback to the default block size
CVE-2026-91151 7.3 HIGH Cockpit: cockpit: local privilege escalation via insecure symlink handling in public key a
CVE-2026-116468 6.6 MEDIUM Keycloak-services: keycloak-services: delegated admin escalates to realm-admin via group m
CVE-2026-124744 6.3 MEDIUM Busybox: cpio hardlink target not sanitized under feature_path_traversal_protection
CVE-2026-124745 6.3 MEDIUM Busybox: tar deferred hardlink target resolved through a deferred symlink escapes the extr
CVE-2026-124746 5.5 MEDIUM Busybox: out-of-bounds read in volume_id_get_buffer() via an offset+length wraparound
CVE-2026-124743 5.5 MEDIUM Busybox: divide-by-zero and heap over-read in the volume_id hfs+ prober
CVE-2026-124742 5.5 MEDIUM Busybox: divide-by-zero in the volume_id fat prober via a zero sectors_per_cluster value
CVE-2026-124738 5.3 MEDIUM Busybox: httpd password rule bypass for pre-compressed .gz files via accept-encoding: gzip
CVE-2026-124740 4.3 MEDIUM Busybox: use-after-free of requested_ipv6 in udhcpc6

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-770