CVE-2026-34525

5.3 MEDIUM

Published: April 01, 2026 Modified: April 16, 2026

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, multiple Host headers were allowed in aiohttp. This issue has been patched in version 3.13.4.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/aio-libs/aiohttp/commit/53e2e6fc58b89c6185be7820bd2c9f40216b3000

Source: security-advisories@github.com

Patch

https://github.com/aio-libs/aiohttp/commit/e00ca3cca92c465c7913c4beb763a72da9ed8349

Source: security-advisories@github.com

Patch

https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4

Source: security-advisories@github.com

Release Notes

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-c427-h43c-vf67

Source: security-advisories@github.com

Patch Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.3 / 10.0

EPSS (Exploit Probability)

0.1%

31th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-20 CWE-444

Affected Vendors

aiohttp

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