CVE-2026-111923: Fleet before 4.89.0 Unauthenticated DoS via Apple MDM Enrollment Plist Parsing

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-17 · updated 2026-10-19
Weakness: CWE-674

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.

Affected products

fleetdm fleet: before 4.89.0 — fixed in 4.89.0

How to fix

Upgrade to a fixed version: fleetdm fleet 4.89.0. Check the vendor advisory for mitigations.

References

https://github.com/fleetdm/fleet/security/advisories/GHSA-x467-vgxf-2g6h
https://www.vulncheck.com/advisories/fleet-before-4.89.0-unauthenticated-dos-via-apple-mdm-enrollment-plist-parsing

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