---
id: "CVE-2026-111063"
kind: "vulnerability"
aliases: ["CVE-2026-111063", "GHSA-494j-54xm-rwp3"]
title: "AIOHTTP: Secure attribute not enforced for shared cookie"
severity: "medium"
cvss: 6.3
epss: 0.002199999988079071
exploited: false
status: "open"
category: "package"
products: [{"name": "aiohttp", "fixed": ["3.14.4"], "affected": "<= 3.14.3", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["aiohttp", "cwe-1004", "cwe-311", "package", "python", "web-client"]
not_affected_if: ["aiohttp-3.14.4-or-later", "no-secure-cookies-over-http"]
published_at: "2026-10-19T17:07:47+00:00"
first_seen_at: "2026-10-23T19:11:32+00:00"
updated_at: "2026-10-23T21:57:18+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-494j-54xm-rwp3", "first_seen_at": "2026-10-23T19:11:32+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111063", "first_seen_at": "2026-10-23T21:57:18+00:00"}]
---

# AIOHTTP: Secure attribute not enforced for shared cookie

aiohttp's cookie handling did not enforce the Secure attribute on shared cookies, so a cookie marked Secure could be sent over an unencrypted HTTP request. An attacker on the network path could capture that cookie, such as a session token.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- pypi:aiohttp affected <= 3.14.3 fixed 3.14.4

## How to check

pip show aiohttp to read the installed version; unknown whether any other file or setting indicates exposure.

## Fix

Upgrade aiohttp to 3.14.4 or later (pip install -U aiohttp).

## Timeline

- 2026-10-23T19:11:32+00:00 ghsa https://github.com/advisories/GHSA-494j-54xm-rwp3
- 2026-10-23T21:57:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111063

## From the sources

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the Secure attribute for a shared cookie is not enforced. An attacker can consequently cause a shared cookie marked Secure to be sent with an unencrypted request. This issue is fixed in version 3.14.4.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_