CVE Feed

    Dashboard / CVE / CVE-2026-12940

    CVE-2026-12940

    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.

    Published:Jul 30, 2026
    Last Modified:Jul 31, 2026
    EPS:Jul 30, 2026
    EPSS Score:
    CVSS Score:9.8

    Affected Products

    Vendor
    Ibm
    Product
    Langflow Oss

    Exploits

    https://github.com/BiiTts/CVE-2026-12940-Langflow-Unauth-RCE

    Related CVEs

    CVE-2026-76059 (CVSS 8.8) — IBM Langflow OSS 1.0.0 through 1.11.5 An attacker who could submit custom component source code could bypass t…
    CVE-2026-78569 (CVSS 8.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow an authenticated attacker to execute arbitrary code due to a…
    CVE-2026-78571 (CVSS 8.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary code du…
    CVE-2026-78575 (CVSS 8.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary command…
    CVE-2026-79723 (CVSS 5) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to obtain sensitive informat…
    CVE-2026-79724 (CVSS 9.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote attacker to execute arbitrary OS commands due to im…
    CVE-2026-79725 (CVSS 6.5) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to read arbitrary files due …
    CVE-2026-79742 (CVSS 8.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary code du…
    CVE-2026-81204 (CVSS 9.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote attacker to execute arbitrary code due to code inje…
    CVE-2026-81211 (CVSS 8.8) — IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary Python …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High