CVE-2026-59675 Rancher Audit-Log Middleware Unauthenticated Memory Exhaustion Denial of Service
Unauthenticated attackers can cause memory exhaustion and service outage in Rancher Manager by sending large payloads to login endpoints when audit logging is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-59675?
CVE-2026-59675 is a high-severity denial of service vulnerability in SUSE Rancher, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When API audit logging is enabled, the middleware reads the entire HTTP request body into memory without enforcing a size limit on login endpoints. Because the audit middleware is positioned earlier in the handler chain than Rancher's APIBodyLimitingHandler, the body-size cap (default 1 MiB) is bypassed for requests that pass through the audit copyReqBody path. An unauthenticated attacker can send arbitrarily large request bodies to the public login endpoints, causing the Rancher Manager server process to allocate memory proportional to the supplied body size. With just a few concurrent connections, this can exhaust available memory and terminate the Rancher Manager plane process, making the Rancher API and UI unavailable and interrupting management of all downstream clusters.
Weakness: CWE-770
Which versions are affected by CVE-2026-59675?
How do I fix CVE-2026-59675?
No fix has been published for CVE-2026-59675 yet. Limit exposure of the affected software until one is available.
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-2026-59675 being exploited?
There is no known exploitation of CVE-2026-59675 in the wild and no public exploit code.
Sources
Also known as GHSA-g4f6-44g4-23xm.