CVE-2026-56150Network attack vector

Authenticated service interruption via excessive upload allocation

Published Jul 1, 2026 · Updated Jul 1, 2026

Resource exhaustion in Elastic Fleet Server 8.0.0 through 8.19.10 and 9.0.0 through 9.2.4 allows remote authenticated users to interrupt service. The upload endpoint processes a specially crafted request by allocating excessive memory without an effective limit or throttle. A valid low-privileged Fleet credential is required; enough consumed memory makes Fleet Server unavailable, with no reported confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability0.48%
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 Elastic Fleet Server 8.0.0 through 8.19.10 and 9.0.0 through 9.2.4 allows remote authenticated users to interrupt service. The upload endpoint processes a specially crafted request by allocating excessive memory without an effective limit or throttle. A valid low-privileged Fleet credential is required; enough consumed memory makes Fleet Server unavailable, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2026-56150
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Elastic
Product
Fleet Server
Classifications
CWE-770, CAPEC-130, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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=8.0.0 <=8.19.10
  2. Affected versionversion=9.0.0 <=9.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Elastic · Fleet Serverversion=8.0.0 <=8.19.10; version=9.0.0 <=9.2.4

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5ElasticCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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