Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.8epss 0.5%
from disclosure to weapon4 days
Published on NVDJul 30
1st PoC+4d
exploitation probability
0.5%top 61% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
IBM · Langflow OSSpublic PoCs found — 1
githubgithub.com/BiiTts/CVE-2026-12940-Langflow-Unauth-RCE★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.