CVE-2026-40990

Application crash via unbounded function-wrapper cache

Published Jun 1, 2026 · Updated Jun 1, 2026

Resource exhaustion in affected Spring Cloud Function releases allows physically proximate attackers to crash the application through function lookups. SimpleFunctionRegistry caches a new FunctionInvocationWrapper for every distinct composed function definition without limiting wrappedFunctionDefinitions, allowing unique lookups to retain objects until heap exhaustion. The vendor assessment requires low privileges, physical access, and user interaction; the bounded consequence is an out-of-memory crash.

CVSS severity5.7
Medium
EPSS probability0.21%
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 affected Spring Cloud Function releases allows physically proximate attackers to crash the application through function lookups. SimpleFunctionRegistry caches a new FunctionInvocationWrapper for every distinct composed function definition without limiting wrappedFunctionDefinitions, allowing unique lookups to retain objects until heap exhaustion. The vendor assessment requires low privileges, physical access, and user interaction; the bounded consequence is an out-of-memory crash.

The record

CVE
CVE-2026-40990
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Spring
Product
Spring Cloud Function
Classifications
CWE-770, T1499.004
Attack vector
physical
Privileges
authenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.2.0 <3.2.16
  2. Affected versionversion=4.1.0 <4.1.10
  3. Affected versionversion=4.2.0 <4.2.6
  4. Affected versionversion=4.3.0 <4.3.3
  5. Affected versionversion=5.0.0 <5.0.2

What conditions does exploitation require?

Attack vectorphysical
Required privilegesauthenticated

What is affected?

Spring · Spring Cloud Functionversion=3.2.0 <3.2.16; version=4.1.0 <4.1.10; version=4.2.0 <4.2.6; version=4.3.0 <4.3.3; version=5.0.0 <5.0.2

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7VMwareCVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:C/C:N/I:L/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)
Vectorphysical
Privilegesauthenticated
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.

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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