CVE-2026-85025 IBM Langflow OSS - Remote Code Execution

IBM Langflow OSS 1.0.0 through 1.11.5 contains a remote code execution caused by improper enforcement of public-flow security restrictions and session isolation controls in MCP project endpoints, letting unauthenticated attackers execute arbitrary code and access or modify chat sessions, exploit requires publicly shared MCP project endpoints.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.61% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to the latest version beyond 1.11.5.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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