High [CVE-2026-76235] unauthenticated remote memory leak via CockpitLang cookie in send_login_html
This high-severity Red Hat Linux advisory covers CVE-2026-76235 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
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.
Red Hat rates this issue as Moderate impact.
Although cockpit-ws is reachable by an unauthenticated remote client and the resulting memory exhaustion can be sustained indefinitely, cockpit-ws is a stateless web console component: its crash or restart does not itself compromise the confidentiality or integrity of the host or of other running services, and the process is automatically restarted by systemd.
Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-401.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat lists Red Hat OpenShift Dev Spaces as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: cockpit.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
Mitigation checklist
- Restrict network access to the cockpit port to trusted clients until a fix is available. No configuration-level mitigation removes the flaw entirely, since the login page must remain reachable without authentication.
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
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