CVE-2026-33682

Vulnerability Description

Streamlit is a data oriented application development framework for python. Streamlit Open Source versions prior to 1.54.0 running on Windows hosts have an unauthenticated Server-Side Request Forgery (SSRF) vulnerability. The vulnerability arises from improper validation of attacker-supplied filesystem paths. In certain code paths, including within the `ComponentRequestHandler`, filesystem paths are resolved using `os.path.realpath()` or `Path.resolve()` before sufficient validation occurs. On Windows systems, supplying a malicious UNC path (e.g., `\\attacker-controlled-host\share`) can cause the Streamlit server to initiate outbound SMB connections over port 445. When Windows attempts to authenticate to the remote SMB server, NTLMv2 challenge-response credentials of the Windows user running the Streamlit process may be transmitted. This behavior may allow an attacker to perform NTLM relay attacks against other internal services and/or identify internally reachable SMB hosts via timing analysis. The vulnerability has been fixed in Streamlit Open Source version 1.54.0.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/streamlit/streamlit/commit/23692ca70b2f2ac720c72d1feb4f190c9dPatch
• https://github.com/streamlit/streamlit/releases/tag/1.54.0ProductRelease Notes
• https://github.com/streamlit/streamlit/security/advisories/GHSA-7p48-42j8-8846Vendor Advisory