RHSA-2026:98567
Vulnerability from csaf_redhat - Published: 2026-11-11 11:38 - Updated: 2026-11-11 19:09Summary
Red Hat Security Advisory: cockpit security update
Severity
Important
Notes
Topic: An update for cockpit is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line sessions, and more.
Security Fix(es):
* cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash (CVE-2026-91147)
* cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)
* cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in send_login_html (CVE-2026-76235)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to exhaust memory on the host and cause a denial of service.
7.5 (High)
Affected products
Fixed
26 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.3.Z:cockpit-packagekit-0:366.1-1.el10_3.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.3.Z:cockpit-storaged-0:366.1-1.el10_3.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1-1.el10_3.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1-1.el10_3.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-bridge-0:366.1-1.el10_3.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1-1.el10_3.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1-1.el10_3.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-doc-0:366.1-1.el10_3.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-system-0:366.1-1.el10_3.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1-1.el10_3.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1-1.el10_3.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in `cockpit-ws`. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a specially crafted request. When the `WebService.UrlRoot` is configured and a request is made to the exact URL-root prefix without a trailing slash, `cockpit-ws` can terminate unexpectedly. This issue leads to the unavailability of the Cockpit web service.
5.9 (Medium)
Affected products
Fixed
26 products, the same list as for
CVE-2026-76235
Threats
Impact
Moderate
A flaw was found in Cockpit. An unauthenticated remote attacker can exploit this vulnerability by initiating and sustaining numerous simultaneous connections to the `cockpit-tls` service. This forces the service to create an unbounded number of detached threads, consuming system resources such as memory and file descriptors. The primary consequence is a denial of service (DoS), leading to degradation or complete unavailability of the Cockpit service for legitimate users.
7.5 (High)
Affected products
Fixed
26 products, the same list as for
CVE-2026-76235
Threats
Impact
Important
References
18 references
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{
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{
"category": "description",
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate availability flaw in `cockpit-ws` can lead to a denial of service. Exploitation requires a non-default `[WebService] UrlRoot` configuration and an unauthenticated request to the exact configured URL-root prefix without a trailing slash, which must reach `cockpit-ws` without front-end normalization or redirection. This makes the vulnerability less easily exploitable in typical Red Hat deployments.",
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},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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"text": "This is an Important denial-of-service flaw in Cockpit, allowing unauthenticated remote attackers to degrade or deny service availability. Exploitation requires network reachability to the Cockpit listener on TCP port 9090, enabling attackers to exhaust system resources by spawning unbounded connection threads. The impact is limited to availability, without affecting confidentiality or integrity.",
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-91149",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91149"
}
],
"release_date": "2026-09-18T16:28:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-11-11T11:38:01+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
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"BaseOS-10.3.Z:cockpit-system-0:366.1-1.el10_3.noarch",
"BaseOS-10.3.Z:cockpit-ws-0:366.1-1.el10_3.aarch64",
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"BaseOS-10.3.Z:cockpit-ws-0:366.1-1.el10_3.x86_64",
"BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1-1.el10_3.aarch64",
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"BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1-1.el10_3.x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:98567"
},
{
"category": "workaround",
"details": "Restrict network access to the Cockpit listener (TCP port 9090) to trusted management networks or localhost only, using host firewall rules such as firewalld zones or iptables rules that limit which sources may reach port 9090. If remote access to the Cockpit web console is not required, disable the listener entirely with `systemctl disable --now cockpit.socket`. External connection-rate or concurrency limits in front of TCP port 9090, such as those enforced by a firewall or reverse proxy, further reduce exploitability. Lowering the service\u0027s task or file-descriptor ceilings can reduce the blast radius, but does not correct the missing concurrency bound in the cockpit-tls accept path; fixes are being pursued for the affected product streams.",
"product_ids": [
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "cockpit: Cockpit: Denial of Service via unbounded connection thread spawning"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.