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Medium, CVSS 6.3amended

In aiohttp, compressed files as symlinks are not protected from path traversal

CVE-2024-42367GHSA-jwhx-xcg6-8xhj

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (aiohttp 3.10.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI aiohttp

    Affected
    >= 3.10.0b1, < 3.10.2
    Fixed in
    3.10.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.3 · 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 · score source
EPSS
  • CVE-2024-42367: 0.65% estimated exploitation activity in the next 30 days; percentile 51.22 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Static 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. Details The server protects static routes from path traversal outside the root directory when followsymlinks=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. Impact Servers 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. ---- Patch: https://github.com/aio-libs/aiohttp/pull/8653/files

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-jwhx-xcg6-8xhj

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-jwhx-xcg6-8xhj

Agent brief

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# Patch Next advisory brief: CVE-2024-42367

Advisory: In aiohttp, compressed files as symlinks are not protected from path traversal
IDs: CVE-2024-42367, GHSA-jwhx-xcg6-8xhj
Record: https://patchnext.com/advisories/cve-2024-42367 (revision 3, source checked 26 Oct 2026, 13:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: aiohttp 3.10.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI aiohttp: affected >= 3.10.0b1, < 3.10.2; fixed in 3.10.2

## Suggested inspection (read-only)
- `python -m pip show aiohttp`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on aiohttp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-jwhx-xcg6-8xhj (OSV record GHSA-jwhx-xcg6-8xhj lists affected ranges: PyPI aiohttp >=3.10.0b1 <3.10.2 (fixed))
- Verified: https://github.com/advisories/GHSA-jwhx-xcg6-8xhj (GitHub-reviewed advisory GHSA-jwhx-xcg6-8xhj lists affected ranges: PyPI aiohttp >=3.10.0b1 <3.10.2)

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