CVE-2026-111924

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductFleet

PublishedOct 17, 2026

First seenOct 17, 2026

Weakness typeCWE-409CWE-409

How to fix

Update

fleetdm fleet4.83.0 or later

Vendor advisories

github.com/fleetdm/fleet/security/advisories/GHSA-3982-g48v-9rwh

Affected products

Product	Affected versions	Fixed in
fleetdm fleet	v < 4.83.0	4.83.0

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