---
id: CVE-2026-77815
title: >-
  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
summary: >-
  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 com…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-59
vendor: zanllp
product: infinite-image-browsing
affected:
  - infinite-image-browsing <= 1.8.0
published: '2026-08-21'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:43:32.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77815'
references:
  - url: 'https://github.com/zanllp/infinite-image-browsing'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/zanllp/infinite-image-browsing/blob/v1.8.0/scripts/iib/api.py#L329-L344
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/zanllp/infinite-image-browsing/blob/v1.8.0/scripts/iib/tool.py#L172-L175
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/zanllp/infinite-image-browsing/commit/4057a624c7a23a36f0b4dc6a545b40767d602450
    label: disclosure@vulncheck.com
  - url: 'https://github.com/zanllp/infinite-image-browsing/issues/968'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/zanllp/infinite-image-browsing/pull/969'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/infinite-image-browsing-resolves-paths-with-normpath-allowing-symlink-escape-from-scanned-directories
    label: disclosure@vulncheck.com
  - url: 'https://github.com/zanllp/infinite-image-browsing/issues/968'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.0061
epssPercentile: 0.46888
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-08-26T17:29:46.505468Z'
ingestedAt: '2026-09-24T15:45:56.698Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.