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CVE-2026-12940

Langflow remote code execution

9.8 CRITICALEPSS 0.94%
  1. Published30 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Langflow≥ 1.0.0 < 1.10.2

Remediation

Fixed in
Langflow≥ 1.10.2

References

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Frequently asked

Is CVE-2026-12940 being actively exploited?

CVE-2026-12940 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.94%.

How severe is CVE-2026-12940?

CVE-2026-12940 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.94% probability of exploitation.

Which products are affected by CVE-2026-12940?

Affected products include Langflow.

How do I fix CVE-2026-12940?

Upgrade affected software to a fixed version, for example Langflow 1.10.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-12940 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.