CVE-2026-111924 Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression
Unauthenticated attackers can crash Fleet instances by sending small, highly compressed gzip requests that exhaust server memory during decompression.
- 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-2026-111924?
CVE-2026-111924 is a high-severity denial of service vulnerability in fleetdm fleet, published on 17 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Fleet before 4.83.0 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server memory by sending gzip-compressed request bodies. Attackers can send small, highly compressed requests with Content-Encoding: gzip to unauthenticated endpoints that expand during decoding, crashing the entire Fleet instance.
Weakness: CWE-409
Which versions are affected by CVE-2026-111924?
How do I fix CVE-2026-111924?
No fix has been published for CVE-2026-111924 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-2026-111924 being exploited?
There is no known exploitation of CVE-2026-111924 in the wild and no public exploit code.
Sources
Also known as GHSA-3982-g48v-9rwh, GHSA-7fp2-q7fp-2qwf.