What’s Vulnerable › Vulnerabilities

CVE-2026-111065: AIOHTTP: Connector pool exhaustion via Max-Age overflow

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-19 · updated 2026-10-19
• Weakness: CWE-770

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Max-Age processing can overflow and skip closing a connection. An attacker can consequently exhaust the connection pool temporarily until garbage collection resolves the connections. This issue is fixed in version 3.14.4.

Affected products

• Pypi Aiohttp: before 3.14.4; 0.1, 0.10.0, 0.10.1, 0.10.2, 0.11.0, 0.12.0 (+304) — fixed in 3.14.4
• aio-libs aiohttp: before 3.14.4

How to fix

Upgrade to a fixed version: Pypi Aiohttp 3.14.4. Check the vendor advisory for mitigations.

References

• https://github.com/aio-libs/aiohttp/commit/9dd8eaf4e31f1237ef2c1574a8c82a739fca5805
• https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-6cjc-53gc-5rqm

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