CVE-2026-111064

highpriority · track · 0EPSS 0.004 · 34 %ileUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.40% (34th) EPSS

CVSS 8.2 · high

Is it mine?

1 products

Check your exposure

Who says so?

1 sources

osv

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

8.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.6–8.2

v4.08.2highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · security-advisories@github.com

v4.04.6mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USprimaryCWE-770US

affected products (1)

Products and version ranges known to be affected.

PyPI aiohttp< 3.14.4osvUSpkg:pypi/aiohttp

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-5wr8-gcqf-gqf3aiohttp server lacks an initial request/header timeout2026-10-19ghsa · osvUS
### Summary The keepalive timeout was not used during the initial portion of a request. ### Impact An attacker could keep an idle connection open indefinitely before sending any data. ### Workaround Use a reverse proxy (as recommended for all production deployments) with sensible keepalive limits.

sources

Which sources assert this record, and when.

osv NVD CVE.org MITRE

published 2026-10-19modified 2026-10-19

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+3263 more

references (3) nvd

External citations — patches, advisories, analysis.

scry

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