CVE-2026-14539Network attack vector

Unauthenticated service crash via unbounded request buffering

Published Jul 31, 2026 · Updated Jul 31, 2026

Resource exhaustion in Google MCP Toolbox for Databases 1.4.0 and earlier allows remote attackers to crash the server via HTTP. The /mcp handler passes each request body to io.ReadAll without a byte limit, so one oversized body grows process memory until OOM termination. Network reachability is sufficient; no authentication or user interaction is required, and the bounded impact is interruption of the Toolbox process.

CVSS severity7.5
High
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 Google MCP Toolbox for Databases 1.4.0 and earlier allows remote attackers to crash the server via HTTP. The /mcp handler passes each request body to io.ReadAll without a byte limit, so one oversized body grows process memory until OOM termination. Network reachability is sufficient; no authentication or user interaction is required, and the bounded impact is interruption of the Toolbox process.

The record

CVE
CVE-2026-14539
Published
Jul 31, 2026
Updated
Jul 31, 2026
Vendor
Go standard library
Product
MCP Toolbox for Databases
Classifications
CWE-770, CAPEC-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 31, 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=0.0.0 <=1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · MCP Toolbox for Databasesversion=0.0.0 <=1.4.0

Published CVSS scores

6.6Google 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/E:U
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
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation DoS

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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