Langflow: IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute…
Langflow
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- Severity
- High, CVSS 8.8
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Record
- CVE-2026-81211
- Affects
- Langflow
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- September 10, 2026
- Source last modified
- September 16, 2026
Description
IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary Python code due to improper authorization of custom components in stored flows.
Description quoted from the NVD record.
Who is affected
Langflow (also called IBM Langflow OSS) is a tool for building apps that use AI language models by linking building blocks into workflows. This flaw affects versions 1.0.0 through 1.11.5. The problem is in how the product checks permissions for custom building blocks inside saved workflows. Someone who can already log in to your Langflow, even remotely over the network, could use this to run any program code they choose on the computer that hosts Langflow. This flaw is rated High.
What to do
- Find out who runs Langflow for your organization: the person who installed it, or an IT provider or vendor that manages it for you.
- If someone on your staff runs it, have them check which version is installed. Versions 1.0.0 through 1.11.5 are affected.
- No fixed version is named for this flaw yet, so check the vendor advisory linked on this page for a fixed release and install it as soon as one is available.
- If an IT provider or vendor runs Langflow for you, send them this advisory and ask when the update will be done.
Analysis written from the source record as of September 16, 2026 and reviewed before publishing.