High 8.2Published Oct 19, 2026

CVE-2026-111064aiohttp server lacks an initial request/header timeout

Updated under an hour ago (2026-10-21 04:20 UTC)

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It affects aio-libs aiohttp. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for aio-libs aiohttp

Exploited in the last 30 days

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, keepalive timeout handling is absent during the initial portion of a request. An attacker can keep an idle connection open indefinitely before sending any request data, consuming server connection capacity. This issue is fixed in version 3.14.4.

CVSS: 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

aio-libs aiohttp aio_libs:aiohttp (from the name)	before 3.14.4	CNA record

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-5wr8-gcqf-gqf3x-refsource-confirm
https://github.com/aio-libs/aiohttp/commit/be846822b4b3a5a54b6163e794b42dc06fba54a3x-refsource-misc
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.