CVE-2026-76235 Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie in send_login_html
Unauthenticated attackers can exhaust host memory via a leak in the login page handler, causing denial of service in Cockpit web console.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-76235?
CVE-2026-76235 is a high-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-401
Which versions are affected by CVE-2026-76235?
How do I fix CVE-2026-76235?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-76235 being exploited?
There is no known exploitation of CVE-2026-76235 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-76235, GHSA-hwfh-3wjq-8p68, MGASA-2026-0408, OESA-2026-3578, UBUNTU-CVE-2026-76235.