CVE-2026-34513: CWE-770: Allocation of Resources Without Limits or Throttling in aio-libs aiohttp
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. This issue has been patched in version 3.13.4.
AI Analysis
Technical Summary
CVE-2026-34513 affects aio-libs aiohttp, an asynchronous HTTP client/server framework for Python's asyncio. Versions before 3.13.4 have an unbounded DNS cache that can grow without limits, resulting in excessive memory consumption. This resource exhaustion vulnerability could lead to a denial of service. The issue is classified under CWE-770, which concerns allocation of resources without limits or throttling. The vulnerability has been fixed in version 3.13.4.
Potential Impact
Exploitation of this vulnerability could cause excessive memory usage in affected aiohttp versions, potentially leading to denial of service conditions. The CVSS score of 2.7 indicates a low severity impact, with no required privileges, no user interaction, and no confidentiality, integrity, or availability impact beyond resource exhaustion.
Mitigation Recommendations
Upgrade aiohttp to version 3.13.4 or later, where this vulnerability has been patched. No other mitigation steps are indicated or necessary.
CVE-2026-34513: CWE-770: Allocation of Resources Without Limits or Throttling in aio-libs aiohttp
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. This issue has been patched in version 3.13.4.
CVSS v4.0
Score 2.7low
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34513 affects aio-libs aiohttp, an asynchronous HTTP client/server framework for Python's asyncio. Versions before 3.13.4 have an unbounded DNS cache that can grow without limits, resulting in excessive memory consumption. This resource exhaustion vulnerability could lead to a denial of service. The issue is classified under CWE-770, which concerns allocation of resources without limits or throttling. The vulnerability has been fixed in version 3.13.4.
Potential Impact
Exploitation of this vulnerability could cause excessive memory usage in affected aiohttp versions, potentially leading to denial of service conditions. The CVSS score of 2.7 indicates a low severity impact, with no required privileges, no user interaction, and no confidentiality, integrity, or availability impact beyond resource exhaustion.
Mitigation Recommendations
Upgrade aiohttp to version 3.13.4 or later, where this vulnerability has been patched. No other mitigation steps are indicated or necessary.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-30T16:03:31.047Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69cec35ae6bfc5ba1dfb4d00
Added to database: 04/02/2026, 19:28:26 UTC
Last enriched: 06/24/2026, 15:08:35 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 123
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