CVE-2026-40984Network attack vector

Unauthenticated service interruption via unbounded HTTP method tags

Published Jun 9, 2026 · Updated Jun 9, 2026

Uncontrolled resource consumption in VMware Micrometer allows remote attackers to interrupt instrumented services via crafted HTTP methods. HTTP server instrumentation uses each request method directly as a low-cardinality metric tag and contextual name, allowing arbitrary values to drive unbounded allocations. Exposure requires an affected artifact with HTTP instrumentation configured and recording metrics; unauthenticated requests can exhaust service resources.

CVSS severity7.5
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in VMware Micrometer allows remote attackers to interrupt instrumented services via crafted HTTP methods. HTTP server instrumentation uses each request method directly as a low-cardinality metric tag and contextual name, allowing arbitrary values to drive unbounded allocations. Exposure requires an affected artifact with HTTP instrumentation configured and recording metrics; unauthenticated requests can exhaust service resources.

The record

CVE
CVE-2026-40984
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
VMware
Product
Micrometer
Classifications
CWE-770, CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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=1.13.0 <1.13.19
  2. Affected versionversion=1.14.0 <1.14.16
  3. Affected versionversion=1.15.0 <1.15.12
  4. Affected versionversion=1.16.0 <1.16.6
  5. Affected versionversion=1.9.0 <1.9.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VMware · Micrometerversion=1.13.0 <1.13.19; version=1.14.0 <1.14.16; version=1.15.0 <1.15.12; version=1.16.0 <1.16.6; version=1.9.0 <1.9.18

Published CVSS scores

7.5VMwareCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5redhat-SADPCVSS: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
CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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