Description

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions on the 3.10 branch prior to version 3.10.2, static routes which contain files with compressed variants (`.gz` or `.br` extension) are vulnerable to path traversal outside the root directory if those variants are symbolic links. The 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 the `Path.stat()` and `Path.open()` to send the file. Version 3.10.2 contains a patch for the issue.

Classification

CVE ID: CVE-2024-42367

CVSS Base Severity: MEDIUM

CVSS Base Score: 4.8

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Products

Vendor: aio-libs

Product: aiohttp

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.24% (probability of being exploited)

EPSS Percentile: 46.81% (scored less or equal to compared to others)

EPSS Date: 2025-06-25 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-42367
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jwhx-xcg6-8xhj
https://github.com/aio-libs/aiohttp/pull/8653
https://github.com/aio-libs/aiohttp/commit/ce2e9758814527589b10759a20783fb03b98339f
https://github.com/aio-libs/aiohttp/blob/e0ff5246e1d29b7710ab1a2bbc972b48169f1c05/aiohttp/web_fileresponse.py#L177
https://github.com/aio-libs/aiohttp/blob/e0ff5246e1d29b7710ab1a2bbc972b48169f1c05/aiohttp/web_urldispatcher.py#L674

Timeline