What’s Vulnerable › Vulnerabilities
CVE-2023-47627: Request smuggling in aiohttp
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2023-11-14 · updated 2026-06-17
- Weakness: CWE-444
Description
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit `d5c12ba89` which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues.
Affected products
- aio-libs aiohttp: before 3.8.6 — fixed in 3.8.6
- Pypi Aiohttp: before 3.8.6; 0.1, 0.10.0, 0.10.1, 0.10.2, 0.11.0, 0.12.0 (+214) — fixed in 3.8.6
How to fix
Upgrade to a fixed version: aio-libs aiohttp 3.8.6; Pypi Aiohttp 3.8.6. Check the vendor advisory for mitigations.
References
- https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUSJVQ7OQ55RWL4XAX2F5EZ73N4ZSH6U/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VDKQ6HM3KNDU4OQI476ZWT4O7DMSIT35/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQYQL6WV535EEKSNH7KRARLLMOW5WXDM/
- https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg
- https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUSJVQ7OQ55RWL4XAX2F5EZ73N4ZSH6U/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VDKQ6HM3KNDU4OQI476ZWT4O7DMSIT35/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQYQL6WV535EEKSNH7KRARLLMOW5WXDM/
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