Vulnerability · Published Aug 21, 2026 · Assigned by VulnCheck
CVE-2026-77815Infinite Image Browsing Resolves Paths With normpath, Allowing Symlink Escape From Scanned Directories
High 7.5
In plain English
A high-severity security flaw in infinite-image-browsing from zanllp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| zanllp | infinite-image-browsing | 0 – through 1.8.0 |
Weakness: CWE-59 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Issue #968 issue-tracking
- GitHub Pull Request #969 issue-tracking
- Fix path traversal in is_path_trusted (CWE-22/CWE-59) patch
- to_abs_path normalising with normpath at v1.8.0 technical-description
- is_path_trusted consuming the unresolved path at v1.8.0 technical-description
- https://github.com/zanllp/infinite-image-browsing product
- VulnCheck Advisory: Infinite Image Browsing Resolves Paths With normpath, Allowing Symlink Escape From Scanned Directories third-party-advisory