{"id":"CVE-2026-12940","aliases":["EUVD-2026-51240","GHSA-gx45-8jc3-gqqr"],"status":"published","title":"Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints","description":"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 DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00943,"percentile":0.61332,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-78"],"published":"2026-07-30T16:41:54Z","modified":"2026-10-25T02:30:37Z","exploits":[{"source":"pocgithub","id":"BiiTts/CVE-2026-12940-Langflow-Unauth-RCE","title":"BiiTts/CVE-2026-12940-Langflow-Unauth-RCE","date":"2026-08-03","url":"https://github.com/BiiTts/CVE-2026-12940-Langflow-Unauth-RCE"}],"products":[{"vendor":"ibm","product":"langflow oss"},{"vendor":"langflow","product":"langflow"}],"references":[{"url":"https://www.ibm.com/support/pages/node/7279995","tags":["vendor-advisory","patch","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12940"},{"url":"https://github.com/advisories/GHSA-gx45-8jc3-gqqr"}],"sources":{"cve":[{"id":"CVE-2026-12940","title":"Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints","description":"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 DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.","status":"published","published":"2026-07-30T16:41:54.216Z","modified":"2026-07-31T03:56:16.617Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:19:48.461833Z"}],"euvd":[{"id":"EUVD-2026-51240","description":"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 DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.","status":"published","published":"2026-07-30T16:41:54Z","modified":"2026-07-31T03:56:16Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T18:02:26.773248Z"}],"ghsa":[{"id":"GHSA-gx45-8jc3-gqqr","title":"IBM Langflow OSS 1.0.0 through 1.10.1  are vulnerable to unauthenticated remote code execution...","description":"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 DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.","status":"published","published":"2026-07-30T18:31:40Z","modified":"2026-07-30T18:31:47Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T15:09:57.873597Z"}],"nvd":[{"id":"CVE-2026-12940","description":"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 DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.","status":"published","published":"2026-07-30T17:16:28.04Z","modified":"2026-10-23T22:10:00.16Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:12:33.955581Z"}],"osv":[{"id":"CVE-2026-12940","description":"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 DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.","status":"published","published":"2026-07-30T17:16:28.04Z","modified":"2026-10-25T02:30:37.146481438Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:57.354194Z"}]}}