GitHub Advisoryadvisory · PyPI

GHSA-4m7w-qmgq-4wj5 aiohttp: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections

LOW Published 2026-06-15 Modified 2026-06-15 Official page ↗
Aliases
CVE-2026-54275
Ecosystem
PyPI
Packages
aiohttp
Severity
Low
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Weaknesses
CWE-297
Reviewed
2026-06-15

Affected packages

• PyPI aiohttp: < 3.14.1 → fixed in 3.14.1

Description

Summary The `server_hostname` TLS SNI check can be bypassed when an existing connection is reused. Impact If an application makes multiple requests to the same domain, but with different per-request `server_hostname` parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. Workaround Disable keep_alive if you need to change the `server_hostname` check between requests. ----- Patch: https://github.com/aio-libs/aiohttp/commit/0ca2b6c28a25726527a8b60f25960262a91ed0e0

Related

Alias · CVE (1)

  • CVE-2026-54275 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability

Weakness · CWE (1)

  • CWE-297 Improper Validation of Certificate with Host Mismatch weakness

References