GitHub Advisoryadvisory · PyPI
GHSA-g84x-mcqj-x9qq AIOHTTP vulnerable to DoS through chunked messages
MEDIUM
Official page ↗
- Aliases
- CVE-2025-69229
- Ecosystem
- PyPI
- Packages
- aiohttp
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
- Weaknesses
- CWE-770
- Reviewed
- 2026-01-05
Affected packages
• PyPI aiohttp: < 3.13.3 → fixed in 3.13.3
Description
Summary
Handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks.
Impact
If an application makes use of the `request.read()` method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time.
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Patch: https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712
Patch: https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229
Related
Alias · CVE (1)
- CVE-2025-69229 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability
Weakness · CWE (1)
- CWE-770 Allocation of Resources Without Limits or Throttling weakness
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq web
- https://nvd.nist.gov/vuln/detail/CVE-2025-69229 advisory
- https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229 web
- https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712 web
- https://github.com/aio-libs/aiohttp package