Langflow: IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to read arbitrary files due…
Langflow
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- Severity
- High, CVSS 7.5
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Record
- CVE-2026-18899
- Affects
- Langflow
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- August 28, 2026
- Source last modified
- September 1, 2026
Description
IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to read arbitrary files due to path traversal.
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 1.11.1. An attacker working remotely could read files stored on the computer or server where Langflow runs, including files they should never be able to see. They do this by tricking the product into reaching outside the folders it is meant to use. This flaw is rated High.
What to do
- Find out who installed or runs Langflow for your organization: a staff member, a volunteer, or an IT provider or vendor who manages it for you.
- If you run it yourselves, have that person check which version is installed. Versions 1.0.0 through 1.11.1 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 it 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 1, 2026 and reviewed before publishing.