CVE-2026-77815

01/Description

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.

02/References8

• github.com/zanllp/infinite-image-browsing
• github.com/zanllp/infinite-image-browsing/blob/v1.8.0/scripts/i…
• github.com/zanllp/infinite-image-browsing/blob/v1.8.0/scripts/i…
• github.com/zanllp/infinite-image-browsing/commit/4057a624c7a23a…
• github.com/zanllp/infinite-image-browsing/issues/968
• github.com/zanllp/infinite-image-browsing/pull/969
• www.vulncheck.com/advisories/infinite-image-browsing-resolves-p…
• github.com/zanllp/infinite-image-browsing/issues/968