Langflow: IBM Langflow OSS 1.0.0 through 1.10.3 could allow an authenticated attacker to execute arbitrary…
Langflow
More for Langflow RSS feed for Langflow
- 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-2026-9201
- Affects
- Langflow
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- August 5, 2026
- Source last modified
- October 24, 2026
Description
IBM Langflow OSS 1.0.0 through 1.10.3 could allow an authenticated attacker to execute arbitrary code due to a cryptographic weakness in the custom component validation mechanism. When the optional hardening mode that restricts execution to trusted component templates is enabled, the application validates component code using a truncated SHA‑256 hash. Because the hash comparison relies on only a portion of the digest, an attacker can craft malicious component code that collides with a trusted template hash and bypasses validation. Successful exploitation allows the attacker to introduce and execute unauthorized Python code within the Langflow process, defeating the intended security control and potentially leading to full compromise of the affected instance.
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. This flaw affects versions 1.0.0 through 1.10.3, but only when the optional hardening mode that limits the product to trusted component templates is turned on. In that mode, a weakness in how Langflow checks custom building blocks lets someone who already has a login slip in harmful code that passes the check. The attacker could then run that code inside Langflow, defeating the safety control and possibly taking full control of that installation. This flaw is rated High.
What to do
- Find out who looks after Langflow for your organization: the person who installed or runs it, or an IT provider or vendor who manages it.
- If you run it yourselves, check whether your copy is version 1.0.0 through 1.10.3 and whether the optional hardening mode for trusted component templates is turned on.
- 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 October 24, 2026 and reviewed before publishing.