CVE catalog
CVE-2026-69243
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using
- Severity
- High · CVSS 7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.44% · Oct 25, 2026
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.
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 | vulnerable |
| Debian | python-aiohttp | bookworm-security | 3.8.4-1+deb12u1 | vulnerable |
| Pip | aiohttp | Not reported | 3.14.2 | fixed |
| PyPI | aiohttp | Not reported | 3.14.2 | fixed |
| PyPI | aiohttp | Not reported | 3.14.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-aiohttp | source | sid | 3.14.3-1 | not yet assigned | Not reported | [1143597] |
| Debian | python-aiohttp | source | forky | 3.14.3-1 | not yet assigned | Not reported | [1143597] |
| Debian | python-aiohttp | source | trixie | (unfixed) | not yet assigned | Not reported | [1143597] |
| Debian | python-aiohttp | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143597] |
| Pip | aiohttp | pip | Not reported | 3.14.2 | Not reported | Not reported | Not reported |
| PyPI | aiohttp | PyPI | Not reported | 3.14.2 | Not reported | PYSEC-2026-3546 | Not reported |
| PyPI | aiohttp | PyPI | Not reported | 3.14.2 | Not reported | GHSA-MFX4-HV73-Q22V | Not reported |
Notes
[trixie] python-aiohttp: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-aiohttp]Affected
Source package: [python-aiohttp]
Details (4)
3.8.4-1+deb12u1· amd64 · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· arm64 · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· amd64 · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· arm64 · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- [python-aiohttp-doc]Affected
Source package: [python-aiohttp]
Details (4)
3.8.4-1+deb12u1· all · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· all · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· all · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· all · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
[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
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11467-1.json]
- [https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98]
- [https://github.com/aio-libs/aiohttp/pull/13017]
- [https://github.com/aio-libs/aiohttp/releases/tag/v3.14.2]
- [https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-69243]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-69243]
- [https://osv.dev/vulnerability/GHSA-mfx4-hv73-q22v]
- [https://security-tracker.debian.org/tracker/CVE-2026-69243]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-69243.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]