CVE-2026-111923 Fleet before 4.89.0 Unauthenticated DoS via Apple MDM Enrollment Plist Parsing
Unauthenticated attackers can crash the Fleet MDM server by sending crafted binary plist payloads to enrollment endpoints, causing resource exhaustion.
- 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-2026-111923?
CVE-2026-111923 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 4.89.0 contains an unbounded recursion vulnerability in Apple MDM enrollment property list parsing that allows unauthenticated attackers to crash the server. Attackers can send a crafted binary plist payload of about 150 bytes to the enrollment endpoints, triggering exponential allocation or infinite recursion that exhausts CPU and memory.
Weakness: CWE-674
Which versions are affected by CVE-2026-111923?
How do I fix CVE-2026-111923?
No fix has been published for CVE-2026-111923 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-2026-111923 being exploited?
There is no known exploitation of CVE-2026-111923 in the wild and no public exploit code.
Sources
Also known as GHSA-jc4v-4w5q-xhc2, GHSA-x467-vgxf-2g6h.