CVE-2026-34525 | THREATINT

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.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-01 | Updated 2026-04-02 | Assigner GitHub_M

MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Problem types

CWE-20: Improper Input Validation

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

< 3.13.4

affected

References

github.com/...iohttp/security/advisories/GHSA-c427-h43c-vf67

github.com/...ommit/53e2e6fc58b89c6185be7820bd2c9f40216b3000

github.com/...ommit/e00ca3cca92c465c7913c4beb763a72da9ed8349

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

cve.org (CVE-2026-34525)

nvd.nist.gov (CVE-2026-34525)

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