id: PYSEC-2026-1108
published: "2026-07-07T14:34:38.838715Z"
modified: "2026-07-07T17:23:37.688935Z"
aliases:
- CVE-2024-42367
- GHSA-jwhx-xcg6-8xhj
summary: In aiohttp, compressed files as symlinks are not protected from path traversal
details: "### Summary\nStatic routes which contain files with compressed variants (`.gz` or `.br` extension) were vulnerable to path traversal outside the root directory if those variants are symbolic links.\n\n### Details\nThe server protects static routes from path traversal outside the root directory when `follow_symlinks=False` (default).  It does this by resolving the requested URL to an absolute path and then checking that path relative to the root.  However, these checks are not performed when looking for compressed variants in the `FileResponse` class, and symbolic links are then automatically followed when performing `Path.stat()` and `Path.open()` to send the file.\n\n### Impact\nServers with static routes that contain compressed variants as symbolic links, pointing outside the root directory, or that permit users to upload or create such links, are impacted.\n\n----\n\nPatch: https://github.com/aio-libs/aiohttp/pull/8653/files"
affected:
- package:
    name: aiohttp
    ecosystem: PyPI
    purl: pkg:pypi/aiohttp
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: 3.10.0b1
    - fixed: 3.10.2
  versions:
  - 3.10.0
  - 3.10.0b1
  - 3.10.0rc0
  - 3.10.1
references:
- type: WEB
  url: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jwhx-xcg6-8xhj
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2024-42367
- type: WEB
  url: https://github.com/aio-libs/aiohttp/pull/8653
- type: FIX
  url: https://github.com/aio-libs/aiohttp/commit/ce2e9758814527589b10759a20783fb03b98339f
- type: PACKAGE
  url: https://github.com/aio-libs/aiohttp
- type: WEB
  url: "https://github.com/aio-libs/aiohttp/blob/e0ff5246e1d29b7710ab1a2bbc972b48169f1c05/aiohttp/web_fileresponse.py#L177"
- type: WEB
  url: "https://github.com/aio-libs/aiohttp/blob/e0ff5246e1d29b7710ab1a2bbc972b48169f1c05/aiohttp/web_urldispatcher.py#L674"
- type: PACKAGE
  url: https://pypi.org/project/aiohttp
- type: ADVISORY
  url: https://github.com/advisories/GHSA-jwhx-xcg6-8xhj
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N