CVE-2026-34525
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.
Published Apr 1, 2026 · updated Jun 17, 2026 · aiohttp aiohttp
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.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Apr 1, 2026 · NIST NVD
Detected
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.
Jun 17, 2026 · NIST NVD
Updated
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.
Affected
- cpe aiohttp/aiohttpversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-34525
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-34525
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.
nvd.nist.gov