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Vulnerability record · CVE-2023-47627 · published 14 November 2023

CVE-2023-47627: Aiohttp http request smuggling vulnerability

Aiohttp · Aiohttp

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.

7.5 CVSS 3.1 High EPSS 0.86% · top 43.2% CWE-444 · HTTP request smuggling
7.5CVSS 3.1 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
11References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d Patch
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/FUSJVQ7OQ55RWL4XAX2F5EZ73
https://lists.fedoraproject.org/archives/list/[email protected]/message/VDKQ6HM3KNDU4OQI476ZWT4O7
https://lists.fedoraproject.org/archives/list/[email protected]/message/WQYQL6WV535EEKSNH7KRARLLM
https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d Patch
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg ExploitVendor Advisory
https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
https://lists.fedoraproject.org/archives/list/[email protected]/message/FUSJVQ7OQ55RWL4XAX2F5EZ73
https://lists.fedoraproject.org/archives/list/[email protected]/message/VDKQ6HM3KNDU4OQI476ZWT4O7
https://lists.fedoraproject.org/archives/list/[email protected]/message/WQYQL6WV535EEKSNH7KRARLLM

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Source: NIST National Vulnerability Database (record CVE-2023-47627), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.