CVE-2023-47627 — HTTP Request Smuggling in Aiohttp

CWE-444 — HTTP Request Smuggling13 documents9 sources
Severity
7.5HIGHNVD
CNA5.3
EPSS
0.3%
top 50.65%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Aio-libs AiohttpAiohttp
Timeline
PublishedNov 14
Latest updateJul 17

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶NVDaiohttp/aiohttp< 3.8.6
▶PyPIaiohttp/aiohttp< 3.8.6
▶CVEListV5aio-libs/aiohttp< 3.8.6+1

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

6
OSV
python-aiohttp vulnerabilities↗2025-07-17
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CVEList
aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators↗2024-01-29
▶
CVEList
Request smuggling in aiohttp↗2023-11-14
▶
OSV
CVE-2023-47627: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python↗2023-11-14
▶
OSV
AIOHTTP has problems in HTTP parser (the python one, not llhttp)↗2023-11-14
▶

📋Vendor Advisories

6
Ubuntu
AIOHTTP vulnerabilities↗2025-07-17
▶
Oracle
Oracle Oracle Siebel CRM Risk Matrix: Siebel Cloud Manager (AIOHTTP) — CVE-2023-47627↗2024-07-15
▶
Red Hat
python-aiohttp: http request smuggling↗2024-01-30
▶
Red Hat
python-aiohttp: numerous issues in HTTP parser with header parsing↗2023-11-15
▶
Microsoft
Request smuggling in aiohttp↗2023-11-14
▶
CVE-2023-47627 — HTTP Request Smuggling in Aiohttp | cvebase