to_abs_path in scripts/iib/tool.py normalised the requested path with os.path.normpath, which collapses dot segments but does not resolve symbolic links. A symlink placed inside a scanned directory therefore satisfies the containment comparison performed by is_path_trusted in scripts/iib/api.py while pointing outside that directory, and FileResponse follows the link when serving the response, so a link created in an image directory and targeting a file such as /etc/passwd discloses that file. Whether the check applies depends on get_enable_access_control in scripts/iib/tool.py: it returns true when IIB_ACCESS_CONTROL is set to enable, false when set to disable, and otherwise true when the host Stable Diffusion WebUI was started with share, ngrok, listen or server_name, falling back to false. Confinement is therefore active in the network-exposed WebUI deployments that rely on it, while a standalone run with no such option serves every readable file regardless of this flaw. The fix resolves the path with os.path.realpath.
References
Configurations
No configuration.
History
No history.
Information
Published : 2026-08-21 15:16
Updated : 2026-08-26 18:17
NVD link : CVE-2026-77815
Mitre link : CVE-2026-77815
CVE.ORG link : CVE-2026-77815
JSON object : View
Products Affected
No product.
CWE
CWE-59
Improper Link Resolution Before File Access ('Link Following')