CVE catalog
CVE-2026-54275
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 applicat
- Severity
- Medium · CVSS 4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.47% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-aiohttp | sid | 3.14.3-1 | fixed |
| Debian | python-aiohttp | forky | 3.14.3-1 | fixed |
| Debian | python-aiohttp | trixie | 3.11.16-1+deb13u1 | vulnerable |
| Debian | python-aiohttp | trixie-security | 3.11.16-1+deb13u1 | vulnerable |
| Debian | python-aiohttp | bookworm | 3.8.4-1+deb12u1 | not affected |
| Debian | python-aiohttp | bookworm-security | 3.8.4-1+deb12u1 | not affected |
| Cpe | python-aiohttp | Not reported | Not reported | vulnerable |
| Cpe | aiohttp | Not reported | 3.14.1 | fixed |
| PyPI | aiohttp | Not reported | 3.14.1 | fixed |
| Cpe | aiohttp | Not reported | 3.14.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-aiohttp | source | sid | 3.14.1-1 | not yet assigned | Not reported | Not reported |
| Debian | python-aiohttp | source | forky | 3.14.1-1 | not yet assigned | Not reported | Not reported |
| Debian | python-aiohttp | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | python-aiohttp | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | aiohttp | cpe | Not reported | 3.14.1 | Not reported | Not reported | Not reported |
| PyPI | aiohttp | PyPI | Not reported | 3.14.1 | Not reported | GHSA-4M7W-QMGQ-4WJ5 | Not reported |
| Cpe | aiohttp | cpe | Not reported | 3.14.1 | Not reported | NVD-CVE-2026-54275 | Not reported |
Notes
[trixie] python-aiohttp: Minor issue
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [python3-aiohttp]Affected
Source package: [python-aiohttp]
Details (4)
3.11.16-1+deb13u1· amd64 · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· arm64 · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· amd64 · trixie-securityAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· arm64 · trixie-securityAffected
nvd · python-aiohttp · debian · 13
- [python-aiohttp-doc]Affected
Source package: [python-aiohttp]
Details (4)
3.11.16-1+deb13u1· all · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· all · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· all · trixie-securityAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· all · trixie-securityAffected
nvd · python-aiohttp · debian · 13
[Debian 12 (Bookworm)]
- [python3-aiohttp]Not affected
Source package: [python-aiohttp]
Details (4)
3.8.4-1+deb12u1· amd64 · bookwormNot affected
nvd · python-aiohttp · debian · bookworm
3.8.4-1+deb12u1· arm64 · bookwormNot affected
nvd · python-aiohttp · debian · bookworm
3.8.4-1+deb12u1· amd64 · bookworm-securityNot affected
nvd · python-aiohttp · debian · bookworm
3.8.4-1+deb12u1· arm64 · bookworm-securityNot affected
nvd · python-aiohttp · debian · bookworm
- [python-aiohttp-doc]Not affected
Source package: [python-aiohttp]
Details (4)
3.8.4-1+deb12u1· all · bookwormNot affected
nvd · python-aiohttp · debian · bookworm
3.8.4-1+deb12u1· all · bookwormNot affected
nvd · python-aiohttp · debian · bookworm
3.8.4-1+deb12u1· all · bookworm-securityNot affected
nvd · python-aiohttp · debian · bookworm
3.8.4-1+deb12u1· all · bookworm-securityNot affected
nvd · python-aiohttp · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11097-1.json]
- [https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4m7w-qmgq-4wj5]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54275]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54275]
- [https://osv.dev/vulnerability/GHSA-4m7w-qmgq-4wj5]
- [https://security-tracker.debian.org/tracker/CVE-2026-54275]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54275.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]