Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat OpenShift Dev Spaces | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cockpit | 368-1 | — |
| Debian 13 | cockpit | No fix yet | — |
| Debian 12 | cockpit | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | cockpit | No fix yet | — |
| Ubuntu 26.04 LTS | cockpit | No fix yet | — |
| Ubuntu 24.04 LTS | cockpit | No fix yet | — |
| Ubuntu 22.04 LTS | cockpit | No fix yet | — |
| Ubuntu 20.04 LTS | cockpit | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | cockpit | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | cockpit +7 | 356.4-1.el10_2 | RHSA-2026:98567, RHSA-2026:96250 |
| RHEL 9 | cockpit +7 | 356.4-1.el9_8 | RHSA-2026:98463, RHSA-2026:94533 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | cockpit +7 | 356.4-1.el9_8 | ALSA-2026:94533 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | cockpit | 356.4-1.el10_2.rocky.0.1 | RLSA-2026:98567, RLSA-2026:96250 |
| Rocky Linux 10 | cockpit-ws +6 | 366.1-1.el10_3.rocky.0.1 | RLSA-2026:98567 |
| Rocky Linux 9 | cockpit | 356.4-1.el9_8.rocky.0.1 | RLSA-2026:94533 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cockpit | 370-1.1 | openSUSE-SU-2026:12427-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | cockpit +7 | 356.4-1.0.1.el9_8 | ELSA-2026-94533 |
Advisories 10
- RHSA-2026:98567 Red Hat Security Advisory: cockpit security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98463 Red Hat Security Advisory: cockpit security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:96250 Red Hat Security Advisory: cockpit security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:94533 Red Hat Security Advisory: cockpit security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:98567 Important: cockpit security update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:96250 Important: cockpit security update Rocky Linux Security Advisories · Nov 10, 2026
- openSUSE-SU-2026:12427-1 cockpit-370-1.1 on GA media SUSE / openSUSE Security Updates · Nov 6, 2026
- ALSA-2026:94533 Important: cockpit security update AlmaLinux Security Advisories · Nov 4, 2026
- RLSA-2026:94533 Important: cockpit security update Rocky Linux Security Advisories · Nov 4, 2026
- ELSA-2026-94533 Important: cockpit security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 3, 2026
References
- RHSA-2026:94533 vendor-advisory
- RHSA-2026:96250 vendor-advisory
- RHSA-2026:98463 vendor-advisory
- RHSA-2026:98567 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-91149 vdb-entry
- RHBZ#2479422 issue-tracking