# CVE-2026-77815: Infinite Image Browsing Resolves Paths With normpath, Allowing Symlink Escape From Scanned Directories

> Attackers can read arbitrary files via symlink escape in Infinite Image Browsing plugin when access control is enabled.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Aug 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-cw66-pfp5-82xp

## What is CVE-2026-77815?

CVE-2026-77815 is a high-severity path traversal vulnerability in zanllp infinite-image-browsing, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-59 (Improper Link Resolution Before File Access)

## Which versions are affected by CVE-2026-77815?


## How do I fix CVE-2026-77815?

No fix has been published for CVE-2026-77815 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-77815 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77815 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-77815 and fix it if it is affected.

What it is: CVE-2026-77815 is a high-severity path traversal vulnerability in zanllp infinite-image-browsing, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77815 exists.

Affected product: zanllp infinite-image-browsing. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-77815/ (Markdown: https://insights.sbomify.com/CVE-2026-77815/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-77815
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77815
- OSV: https://osv.dev/vulnerability/CVE-2026-77815

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-77815/
Summaries are generated and may contain mistakes; the official description above is the record.