{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-12940 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-12940 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-12940 is a critical command injection vulnerability in Langflow Langflow, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-12940 and fix it if it is affected.\n\nWhat it is: CVE-2026-12940 is a critical command injection vulnerability in Langflow Langflow, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-12940 in the wild and no public exploit code.\n\nAffected product: Langflow Langflow. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-12940/ (Markdown: https://insights.sbomify.com/CVE-2026-12940/index.md)","id":"CVE-2026-12940","markdown":"https://insights.sbomify.com/CVE-2026-12940/index.md","name":"CVE-2026-12940","record":{"aliases":["GHSA-gx45-8jc3-gqqr"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Langflow OSS","requires_auth":"none","summary":"Unauthenticated attackers can execute arbitrary code via environment variable injection in the MCP stdio launcher due to an incomplete blocklist.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"ibm","cpe":[{"product":"langflow","vendor":"langflow"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-08-03","github_poc":1,"max_poc_stars":4,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-08-03T03:11:39Z","kind":"github_poc","ref":"https://github.com/BiiTts/CVE-2026-12940-Langflow-Unauth-RCE","stars":4,"title":"CVE-2026-12940 — Langflow OSS \u003c=1.10.1 unauthenticated RCE via MCP stdio environment-variable injection (SHELLOPTS/PS4). Author PoC + source analysis + lab."}],"tier":"poc_unverified"},"has_fix":false,"headline":"Command injection in Langflow OSS","id":"CVE-2026-12940","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"langflow:langflow","products":["langflow:langflow"],"type":"command_injection","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"MultiVendorX \u003c= 5.0.9 - Authenticated (Store Owner+) SQL Injection via 'order_by' Parameter","id":"CVE-2026-12941"},"packages":[],"prev":{"headline":"Newsletters \u003c= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link' Shortcode Attribute","id":"CVE-2026-12939"},"products":["Langflow OSS"],"published":"2026-07-30","related":[{"cvss_score":9.8,"headline":"IBM Langflow Code Injection","id":"CVE-2026-9198","kev_date_added":"2026-08-04","published":"2026-07-17"},{"cvss_score":9.8,"headline":"Langflow Inclusion of Functionality from Untrusted Control Sphere","id":"CVE-2026-0770","kev_date_added":"2026-07-21","published":"2026-01-23"},{"cvss_score":9.8,"headline":"Langflow Missing Authentication","id":"CVE-2025-3248","kev_date_added":"2025-05-05","published":"2025-04-07"},{"cvss_score":9.4,"headline":"Langflow Origin Validation Error","id":"CVE-2025-34291","kev_date_added":"2026-05-21","published":"2025-12-05"},{"cvss_score":9.3,"headline":"Langflow Code Injection","id":"CVE-2026-33017","kev_date_added":"2026-03-25","published":"2026-03-20"},{"cvss_score":8.4,"headline":"Langflow Authorization Bypass Through User-Controlled Key","id":"CVE-2026-55255","kev_date_added":"2026-07-07","published":"2026-06-23"},{"cvss_score":10,"headline":"Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows","id":"CVE-2026-10134","kev_date_added":null,"published":"2026-06-30"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-31","vendors":["IBM"]},"summary":"Unauthenticated attackers can execute arbitrary code via environment variable injection in the MCP stdio launcher due to an incomplete blocklist.","url":"https://insights.sbomify.com/CVE-2026-12940/"}