GitHub Advisoryadvisory · PyPI
GHSA-hcc4-c3v8-rx92 AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector
LOW
Official page ↗
- Aliases
- CVE-2026-34513
- Ecosystem
- PyPI
- Packages
- aiohttp
- Severity
- Low
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
- Weaknesses
- CWE-770
- Reviewed
- 2026-04-01
Affected packages
• PyPI aiohttp: < 3.13.4 → fixed in 3.13.4
Description
Summary
An unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation.
Impact
If an application makes requests to a very large number of hosts, this could cause the DNS cache to continue growing and slowly use excessive amounts of memory.
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Patch: https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98
Related
Alias · CVE (1)
- CVE-2026-34513 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-hcc4-c3v8-rx92 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-34513 advisory
- https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98 web
- https://github.com/aio-libs/aiohttp package
- https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 web