CVE-2026-14539

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Source
https://cve.org/CVERecord?id=CVE-2026-14539
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-14539.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-14539
Published
2026-07-31T01:45:35Z
Modified
2026-08-12T03:51:28Z
Severity
  • 6.6 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Denial of Service via Unrestricted Payload Buffering in MCP Toolbox
Details

An allocation of resources without limits vulnerability in the HTTP handler component of Google mcp-toolbox versions up to and including 1.4.0 allows an unauthenticated attacker to cause a denial of service (DoS). The /mcp endpoint handler reads incoming payloads directly into system memory using an unrestricted buffer loop (io.ReadAll) without applying defensive constraints such as http.MaxBytesReader or pre-read Content-Length enforcement. By submitting a single, massive HTTP request body, an attacker can linearly consume available host memory until the runtime process is terminated by an Out-Of-Memory (OOM) error.

Database specific 
{
    "cna_assigner": "Google",
    "cwe_ids": [
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14539.json"
}
References

Affected packages

Git / github.com/googleapis/mcp-toolbox

Affected ranges

Type
GIT
Repo
https://github.com/googleapis/mcp-toolbox
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
45c0f86ce0199a8aed9c980370dd2c03f2684f5a
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:google:mcp_toolbox_for_databases:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0.0.0"
        },
        {
            "last_affected": "1.4.0"
        },
        {
            "introduced": "0"
        },
        {
            "fixed": "1.5.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

v0.*
v0.0.1
v0.0.2
v0.0.3
v0.0.4
v0.0.5
v0.1.0
v0.10.0
v0.11.0
v0.12.0
v0.13.0
v0.14.0
v0.15.0
v0.16.0
v0.17.0
v0.18.0
v0.19.1
v0.2.0
v0.2.1
v0.20.0
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.26.0
v0.27.0
v0.28.0
v0.29.0
v0.3.0
v0.30.0
v0.31.0
v0.32.0
v0.4.0
v0.5.0
v0.6.0
v0.7.0
v0.8.0
v0.9.0
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.3.0
v1.4.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-14539.json"