CVE-2026-54275
CVE-2026-54275 · AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
This page contains facts from public vulnerability sources. Check the original advisory before updating.
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. 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. This vulnerability is fixed in 3.14.1.
CVSS 2.7 · Low · EPSS 0.5% · Fix available
- Published
- Updated
Affected products and versions
aiohttp
- Versions
- < 3.14.1: Affected
No fix published
python-aiohttp Debian:13
- Versions
- 3.11.16-1
- 3.11.16-1+deb13u1
- 3.12.15-1
- 3.13.0-1
- 3.13.1-1
- 3.13.3-1
- 3.13.3-2
- 3.13.3-3
- 3.13.5-1
- 3.14.0-1
- 3.14.1-1
- 3.14.1-2
- 3.14.1-3
- 3.14.1-4
- 3.14.1-5
- 3.14.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Debian:14
- Versions
- 3.11.16-1
- 3.12.15-1
- 3.13.0-1
- 3.13.1-1
- 3.13.3-1
- 3.13.3-2
- 3.13.3-3
- 3.13.5-1
- 3.14.0-1
- Affected ranges
- ECOSYSTEM: < 3.14.1-1
Update to 3.14.1-1
aiohttp PyPI
- Versions
- 0.1
- 0.10.0
- 0.10.1
- 0.10.2
- 0.11.0
- 0.12.0
- 0.13.0
- 0.13.1
- 0.14.0
- 0.14.1
- 0.14.2
- 0.14.3
- 0.14.4
- 0.15.0
- 0.15.1
- 0.15.2
- 0.15.3
- 0.16.0
- 0.16.1
- 0.16.2
- 0.16.3
- 0.16.4
- 0.16.5
- 0.16.6
- 0.17.0
- 0.17.1
- 0.17.2
- 0.17.3
- 0.17.4
- 0.18.0
- 0.18.1
- 0.18.2
- 0.18.3
- 0.18.4
- 0.19.0
- 0.2
- 0.20.0
- 0.20.1
- 0.20.2
- 0.21.0
- 0.21.1
- 0.21.2
- 0.21.4
- 0.21.5
- 0.21.6
- 0.22.0
- 0.22.0a0
- 0.22.0b0
- 0.22.0b1
- 0.22.0b2
- 0.22.0b3
- 0.22.0b4
- 0.22.0b5
- 0.22.0b6
- 0.22.1
- 0.22.2
- 0.22.3
- 0.22.4
- 0.22.5
- 0.3
- 0.4
- 0.4.1
- 0.4.2
- 0.4.3
- 0.4.4
- 0.5.0
- 0.6.0
- 0.6.1
- 0.6.2
- 0.6.3
- 0.6.4
- 0.6.5
- 0.7.0
- 0.7.1
- 0.7.2
- 0.7.3
- 0.8.0
- 0.8.1
- 0.8.2
- 0.8.3
- 0.8.4
- 0.9.0
- 0.9.1
- 0.9.2
- 0.9.3
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.0.5
- 1.1.0
- 1.1.1
- 1.1.2
- 1.1.3
- 1.1.4
- 1.1.5
- 1.1.6
- 1.2.0
- 1.3.0
- 1.3.1
- 1.3.2
- 1.3.3
- 1.3.4
- 1.3.5
- 2.0.0
- 2.0.0rc1
- 2.0.1
- 2.0.2
- 2.0.3
- 2.0.4
- 2.0.5
- 2.0.6
- 2.0.7
- 2.1.0
- 2.2.0
- 2.2.1
- 2.2.2
- 2.2.3
- 2.2.4
- 2.2.5
- 2.3.0
- 2.3.0a1
- 2.3.0a2
- 2.3.0a3
- 2.3.0a4
- 2.3.1
- 2.3.10
- 2.3.1a1
- 2.3.2
- 2.3.2b2
- 2.3.2b3
- 2.3.3
- 2.3.4
- 2.3.5
- 2.3.6
- 2.3.7
- 2.3.8
- 2.3.9
- 3.0.0
- 3.0.0b0
- 3.0.0b1
- 3.0.0b2
- 3.0.0b3
- 3.0.0b4
- 3.0.1
- 3.0.2
- 3.0.3
- 3.0.4
- 3.0.5
- 3.0.6
- 3.0.7
- 3.0.8
- 3.0.9
- 3.1.0
- 3.1.1
- 3.1.2
- 3.1.3
- 3.10.0
- 3.10.0b1
- 3.10.0rc0
- 3.10.1
- 3.10.10
- 3.10.11
- 3.10.11rc0
- 3.10.2
- 3.10.3
- 3.10.4
- 3.10.5
- 3.10.6
- 3.10.6rc0
- 3.10.6rc1
- 3.10.6rc2
- 3.10.7
- 3.10.8
- 3.10.9
- 3.11.0
- 3.11.0b0
- 3.11.0b1
- 3.11.0b2
- 3.11.0b3
- 3.11.0b4
- 3.11.0b5
- 3.11.0rc0
- 3.11.0rc1
- 3.11.0rc2
- 3.11.1
- 3.11.10
- 3.11.11
- 3.11.12
- 3.11.13
- 3.11.14
- 3.11.15
- 3.11.16
- 3.11.17
- 3.11.18
- 3.11.2
- 3.11.3
- 3.11.4
- 3.11.5
- 3.11.6
- 3.11.7
- 3.11.8
- 3.11.9
- 3.12.0
- 3.12.0b0
- 3.12.0b1
- 3.12.0b2
- 3.12.0b3
- 3.12.0rc0
- 3.12.0rc1
- 3.12.1
- 3.12.10
- 3.12.11
- 3.12.12
- 3.12.13
- 3.12.14
- 3.12.15
- 3.12.1rc0
- 3.12.2
- 3.12.3
- 3.12.4
- 3.12.6
- 3.12.7
- 3.12.7rc0
- 3.12.8
- 3.12.9
- 3.13.0
- 3.13.1
- 3.13.2
- 3.13.3
- 3.13.4
- 3.13.5
- 3.14.0
- 3.2.0
- 3.2.1
- 3.3.0
- 3.3.0a0
- 3.3.1
- 3.3.2
- 3.3.2a0
- 3.4.0
- 3.4.0a0
- 3.4.0a3
- 3.4.0b1
- 3.4.0b2
- 3.4.1
- 3.4.2
- 3.4.3
- 3.4.4
- 3.5.0
- 3.5.0a1
- 3.5.0b1
- 3.5.0b2
- 3.5.0b3
- 3.5.1
- 3.5.2
- 3.5.3
- 3.5.4
- 3.6.0
- 3.6.0a0
- 3.6.0a1
- 3.6.0a11
- 3.6.0a12
- 3.6.0a2
- 3.6.0a3
- 3.6.0a4
- 3.6.0a5
- 3.6.0a6
- 3.6.0a7
- 3.6.0a8
- 3.6.0a9
- 3.6.0b0
- 3.6.1
- 3.6.1b3
- 3.6.1b4
- 3.6.2
- 3.6.2a0
- 3.6.2a1
- 3.6.2a2
- 3.6.3
- 3.7.0
- 3.7.0b0
- 3.7.0b1
- 3.7.1
- 3.7.2
- 3.7.3
- 3.7.4
- 3.7.4.post0
- 3.8.0
- 3.8.0a7
- 3.8.0b0
- 3.8.1
- 3.8.2
- 3.8.3
- 3.8.4
- 3.8.5
- 3.8.6
- 3.9.0
- 3.9.0b0
- 3.9.0b1
- 3.9.0rc0
- 3.9.1
- 3.9.2
- 3.9.3
- 3.9.4
- 3.9.4rc0
- 3.9.5
- Affected ranges
- ECOSYSTEM: < 3.14.1
Update to 3.14.1
python-aiohttp Ubuntu:Pro:16.04:LTS
- Versions
- 0.17.2-1
- 0.17.4-1
- 0.17.4-1build1
- 0.20.2-1
- 0.20.2-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:18.04:LTS
- Versions
- 2.2.3-1build1
- 2.2.3-2
- 2.3.6-1
- 3.0.1-1
- 3.0.1-1ubuntu0.1~esm1
- 3.0.1-1ubuntu0.1~esm4
- 3.0.1-1ubuntu0.1~esm5
- 3.0.1-1ubuntu0.1~esm6
- 3.0.1-1ubuntu0.1~esm7
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:20.04:LTS
- Versions
- 3.5.4-1
- 3.5.4-1build1
- 3.6.1-1
- 3.6.2-1
- 3.6.2-1build1
- 3.6.2-1ubuntu0.1~esm1
- 3.6.2-1ubuntu1
- 3.6.2-1ubuntu1+esm1
- 3.6.2-1ubuntu1+esm3
- 3.6.2-1ubuntu1+esm4
- 3.6.2-1ubuntu1+esm5
- 3.6.2-1ubuntu1+esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:22.04:LTS
- Versions
- 3.7.4-1
- 3.7.4-1build2
- 3.8.1-3
- 3.8.1-4
- 3.8.1-4build1
- 3.8.1-4ubuntu0.2
- 3.8.1-4ubuntu0.2+esm1
- 3.8.1-4ubuntu0.2+esm2
- 3.8.1-4ubuntu0.2+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:24.04:LTS
- Versions
- 3.8.4-1
- 3.9.1-1
- 3.9.1-1build1
- 3.9.1-1ubuntu0.1
- 3.9.1-1ubuntu0.1+esm1
- 3.9.1-1ubuntu0.1+esm2
- 3.9.1-1ubuntu0.1+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:25.10
- Versions
- 3.10.11-1build1
- 3.11.16-1
- 3.11.16-1ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:26.10
- Versions
- 3.13.3-3ubuntu1
- 3.14.1-4
- 3.14.1-5
- 3.14.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:26.04:LTS
- Versions
- 3.11.16-1
- 3.13.1-1
- 3.13.3-3
- 3.13.3-3ubuntu1
- 3.13.3-3ubuntu1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published