CVE catalog
CVE-2023-37276
python-aiohttp: CVE-2023-37276
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.34% · Oct 25, 2026
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. aiohttp v3.8.4 and earlier are bundled with llhttp v6.0.6. Vulnerable code is used by aiohttp for its HTTP request parser when available which is the default case when installing from a wheel. This vulnerability only affects users of aiohttp as an HTTP server (ie `aiohttp.Application`), you are not affected by this vulnerability if you are using aiohttp as an HTTP client library (ie `aiohttp.ClientSession`). Sending a crafted HTTP request will cause the server to misinterpret one of the HTTP header values leading to HTTP request smuggling. This issue has been addressed in version 3.8.5. Users are advised to upgrade. Users unable to upgrade can reinstall aiohttp using `AIOHTTP_NO_EXTENSIONS=1` as an environment variable to disable the llhttp HTTP request parser implementation. The pure Python implementation isn't vulnerable.
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 | fixed |
| Debian | python-aiohttp | trixie-security | 3.11.16-1+deb13u1 | fixed |
| Debian | python-aiohttp | bookworm | 3.8.4-1+deb12u1 | vulnerable |
| Debian | python-aiohttp | bookworm-security | 3.8.4-1+deb12u1 | vulnerable |
| Ubuntu | python-aiohttp | 22.04 | 3.7.4-1 | vulnerable |
| Ubuntu | python-aiohttp | 22.04 | 3.7.4-1build2 | vulnerable |
| Ubuntu | python-aiohttp | 22.04 | 3.8.1-3 | vulnerable |
| Ubuntu | python-aiohttp | 22.04 | 3.8.1-4 | vulnerable |
| Ubuntu | python-aiohttp | 22.04 | 3.8.1-4build1 | vulnerable |
| Ubuntu | python-aiohttp | 22.04 | 3.8.1-4ubuntu0.2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-aiohttp | source | sid | 3.8.5-1 | not yet assigned | Not reported | Not reported |
| Debian | python-aiohttp | source | forky | 3.8.5-1 | not yet assigned | Not reported | Not reported |
| Debian | python-aiohttp | source | trixie | 3.8.5-1 | not yet assigned | Not reported | Not reported |
| Debian | python-aiohttp | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
Notes
[bookworm] python-aiohttp: Minor issue
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://access.redhat.com/errata/RHSA-2024:1878]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-37276]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2023-37276]
- [https://security-tracker.debian.org/tracker/CVE-2023-37276]
- [https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-0949.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]