Vulnerability in Fleetdm Fleet
CVE-2026-111924
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.
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/fleetdm/fleet/security/advisories/GHSA-3982-g48v-9rwh (vendor-advisory)
- www.vulncheck.com/advisories/fleet-before-4.83.0-denial-of-service-via-unbounde… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111924?
- CVE-2026-111924 is a high-severity vulnerability in Fleetdm Fleet, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 7.5/10. Published 2026-10-17.
- How severe is CVE-2026-111924?
- High severity. CVSS v3 base score is 7.5 out of 10.