Unbounded DNS Cache Vulnerability in AIOHTTP Framework
CVE-2026-34513

2.7LOW

Key Information:

Vendor

Aio-libs

Status
Aiohttp
Vendor
CVE Published:
1 April 2026

What is CVE-2026-34513?

The AIOHTTP framework, essential for creating asynchronous HTTP clients and servers in Python, contains a vulnerability related to an unbounded DNS cache. This flaw can lead to excessive memory consumption, potentially resulting in a Denial of Service (DoS). This issue has been addressed in version 3.13.4, and it is crucial for users to upgrade to this version to mitigate the risks associated with this vulnerability.

Affected Version(s)

aiohttp < 3.13.4

References

https://github.com/aio-libs/aiohttp/security/advisories/G...
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/c4d77c3533122b...
x_refsource_MISC
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
x_refsource_MISC

CVSS V4

Score:
2.7
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.