CVE-2026-12940

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Source
https://cve.org/CVERecord?id=CVE-2026-12940
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12940.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-12940
Published
2026-07-30T17:16:28.040Z
Modified
2026-08-06T08:28:39.741012Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

IBM Langflow OSS 1.0.0 through 1.10.1  are vulnerable to unauthenticated remote code execution via environment variable injection in the MCP (Model Context Protocol) stdio launcher. The vulnerability exists in src/lfx/src/lfx/base/mcp/util.py where the DANGEROUSENVVARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.

References

Affected packages

Git / github.com/langflow-ai/langflow

Affected ranges

Type
GIT
Repo
https://github.com/langflow-ai/langflow
Events
Introduced
24d9e86885b877ea3e9d03cbc50b963765489721
Fixed
a69a47ff1b5c99ce9c50edc4df45de4397151f17
Database specific 
{
    "extracted_events": [
        {
            "introduced": "1.0.0"
        },
        {
            "fixed": "1.10.2"
        }
    ],
    "cpe": "cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12940.json"