Paper/Archive/CVE-2026-12940

CVE-2026-12940

IBM Langflow OSS — Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints

EPSS 0.9%CVSS 9.8

critical.is priorityof 100

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 61.0.610 × 2012.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

Langflow OSS1.0.0 – 1.10.1–CNA

Scores by source

ibm (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchibm.com/support/pages/node/7279995