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CVE-2026-111924— Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression

Quick assessment

Affected
fleetdm fleet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

4.83.0 之前的 Fleet 版本存在一个拒绝服务（DoS）漏洞。未认证的攻击者可以通过发送经过 gzip 压缩的请求体，耗尽服务器内存。攻击者能够向未认证的端点发送体积小但高度压缩的请求（设置 Content-Encoding: gzip），这些请求在解码时会急剧膨胀，从而导致整个 Fleet 实例崩溃。

CVSS 7.5 · High EPSS 0.36% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
fleetdm fleet < 4.83.0 affected
4.83.0 unaffected
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I. Basic Information for CVE-2026-111924

Vulnerability Information
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Vulnerability Title
Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fleetdm fleet 0 ~ 4.83.0 -

II. Public POCs for CVE-2026-111924

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-111924

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Vendor Advisories for CVE-2026-111924 (1)

Vendor Pages for CVE-2026-111924 (1)

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-409

V. Comments for CVE-2026-111924

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