Vulnerability · Published Aug 19, 2026 · Assigned by redhat
CVE-2026-76235Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie in send_login_html
High 7.5
In plain English
A high-severity memory leak in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 51.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | cockpit | 310.10-1.el8_10 | ALSA-2026:94485 |
| AlmaLinux:9 | cockpit | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:8 | cockpit-bridge | 310.10-1.el8_10 | ALSA-2026:94485 |
| AlmaLinux:9 | cockpit-bridge | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:8 | cockpit-doc | 310.10-1.el8_10 | ALSA-2026:94485 |
| AlmaLinux:9 | cockpit-doc | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:9 | cockpit-packagekit | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:9 | cockpit-storaged | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:8 | cockpit-system | 310.10-1.el8_10 | ALSA-2026:94485 |
| AlmaLinux:9 | cockpit-system | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:8 | cockpit-ws | 310.10-1.el8_10 | ALSA-2026:94485 |
| AlmaLinux:9 | cockpit-ws | 356.4-1.el9_8 | ALSA-2026:94533 |
| AlmaLinux:9 | cockpit-ws-selinux | 356.4-1.el9_8 | ALSA-2026:94533 |
| Debian:12 | cockpit | no fix listed | DEBIAN-CVE-2026-76235 |
| Debian:13 | cockpit | 337-1+deb13u2 | DEBIAN-CVE-2026-76235 |
| Debian:14 | cockpit | 366-1 | DEBIAN-CVE-2026-76235 |
| Rocky Linux:8 | cockpit | 0:310.10-1.el8_10 | RLSA-2026:94485 |
| Rocky Linux:9 | cockpit | 0:356.4-1.el9_8.rocky.0.1 | RLSA-2026:94533 |
| Ubuntu:22.04:LTS | cockpit | no fix listed | UBUNTU-CVE-2026-76235 |
| Ubuntu:24.04:LTS | cockpit | no fix listed | UBUNTU-CVE-2026-76235 |
| Ubuntu:26.04:LTS | cockpit | no fix listed | UBUNTU-CVE-2026-76235 |
| Ubuntu:26.10 | cockpit | no fix listed | UBUNTU-CVE-2026-76235 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat OpenShift Dev Spaces | see references |
| Red Hat | Red Hat OpenShift Dev Spaces | see references |
| Red Hat | Red Hat OpenShift Dev Spaces | see references |
Weakness: CWE-401 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- RHSA-2026:94485 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:94533 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-76235 vdb-entry, x_refsource_REDHAT
- RHBZ#2519497 issue-tracking, x_refsource_REDHAT