CVE-2026-26061Network attack vector

Server restart via unbounded HTTP body reads

Published Mar 27, 2026 · Updated Mar 27, 2026

Resource exhaustion in Fleet before 4.81.0 allows remote attackers to restart the server process with oversized HTTP requests. Multiple unauthenticated HTTP handlers read entire request bodies without a size limit, allowing attacker-controlled payloads to drive memory allocation. No authentication or user interaction is required; the documented impact is memory exhaustion and a Fleet server restart, with no data exposure or integrity impact.

CVSS severity8.7
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Fleet before 4.81.0 allows remote attackers to restart the server process with oversized HTTP requests. Multiple unauthenticated HTTP handlers read entire request bodies without a size limit, allowing attacker-controlled payloads to drive memory allocation. No authentication or user interaction is required; the documented impact is memory exhaustion and a Fleet server restart, with no data exposure or integrity impact.

The record

CVE
CVE-2026-26061
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Fleet Device Management
Product
Fleet
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.81.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fleet Device Management · Fleetversion=< 4.81.0

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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