CVE-2026-19306 Path traversal in Langflow OSS
Authenticated attackers can read arbitrary server files and exfiltrate secrets via path traversal in Langflow components, bypassing local file access restrictions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19306?
CVE-2026-19306 is a high-severity path traversal vulnerability in Langflow Langflow, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM Langflow OSS 1.0.0 through 1.11.2 allows an authenticated attacker to read arbitrary files from the server filesystem — including server secret material (secret_key, JWT signing keys, the application database, /proc/self/environ, and other tenants' upload directories) — by supplying absolute paths or traversal sequences in the files parameter of an authenticated build request. The file contents were embedded as text attachments in the language model prompt and transmitted to the configured model endpoint, resulting in confidential data exfiltration. This bypassed the LANGFLOW_RESTRICT_LOCAL_FILE_ACCESS=true containment boundary, which was enforced for other file-reading components but not for the Chat Input to Message attachment pipeline.
Weakness: CWE-22
Which versions are affected by CVE-2026-19306?
It affects 1 product.
Products include Langflow Langflow.
How do I fix CVE-2026-19306?
No fix has been published for CVE-2026-19306 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-19306 being exploited?
There is no known exploitation of CVE-2026-19306 in the wild and no public exploit code.
Other vulnerabilities in Langflow Langflow
Sources
Also known as GHSA-hh38-vgr5-vvww.