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CVE-2024-42367VulnerabilityPublished

CVE-2024-42367: aio-libs aiohttp · UNIX Symbolic Link (Symlink) Following

Affects aio-libs aiohttpSource CVE Database V5

0

Not known to be exploited · CVSS 4.8 Medium : upgrade to 3.8.5 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
4.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.8.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Jun 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade aio-libs aiohttp to 3.8.5.

Affected software

ProductAffectedFixed in
PyPIaiohttppkg:pypi/aiohttpOther threatsAffected
  • <3.8.5
Fixed in
  • 3.8.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

An official fix is available in aiohttp version 3.8.5 and later. Users should upgrade to version 3.8.5 or above to remediate this vulnerability. Until patched, avoid using compressed file variants as symbolic links in static routes or restrict user ability to upload or create such symbolic links.

Description

A path traversal vulnerability exists in aiohttp versions prior to 3.8.5 when serving static routes with compressed file variants (.gz or .br) that are symbolic links. The server's default protection against path traversal does not apply to these compressed variants, allowing symbolic links to be followed outside the root directory. This can lead to unauthorized file access if such symbolic links point outside the intended directory or if users can create/upload them.

References

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