CVE-2023-47627 — HTTP Request Smuggling in Aiohttp

Vendor	Product	Version range	Fixed in
aio-libs	aiohttp	< 3.9.2	3.9.2
aiohttp	aiohttp	< 3.9.2	3.9.2
aiohttp	aiohttp	< 3.8.6	3.8.6
aiohttp	aiohttp	>= 0 < 3.8.6	3.8.6
debian	python-aiohttp	< python-aiohttp 3.8.4-1+deb12u1 (bookworm)	python-aiohttp 3.8.4-1+deb12u1 (bookworm)
debian	python-aiohttp	< python-aiohttp 3.7.4-1+deb11u1 (bullseye)	python-aiohttp 3.7.4-1+deb11u1 (bullseye)
fedoraproject	fedora	—	—
msrc	azl3_mozjs_102.15.1-1_on_azure_linux_3.0	—	—

OSV

python-aiohttp vulnerabilities

osv·2025-07-17·CVSS 7.5

CVE-2023-47627 [HIGH] python-aiohttp vulnerabilities python-aiohttp vulnerabilities Ben Kallus discovered that AIOHTTP did not correctly parse HTTP headers. A remote attacker could possibly use this issue to perform request smuggling. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-47627) Ivan Novikov discovered that AIOHTTP did not properly validate certain inputs. A remote attacker could possibly use this issue to perform request smuggling. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-49081, CVE-2023-49082) Paul J. Dorn discovered that AIOHTTP did not properly validate certain inputs. A remote attacker could possibly use this issue to perform request smuggling. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2024-23829) Takes

OSV

CVE-2024-23829: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python

osv·2024-01-29·CVSS 7.5

CVE-2024-23829 [HIGH] CVE-2024-23829: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Security-sensitive parts of the Python HTTP parser retained minor differences in allowable character sets, that must trigger error handling to robustly match frame boundaries of proxies in order to protect against injection of additional requests. Additionally, validation could trigger exceptions that were not handled consistently with processing of other malformed input. Being more lenient than internet standards require could, depending on deployment environment, assist in request smuggling. The unhandled exception could cause excessive resource consumption on the application server and/or its logging facilities. This vulnerability exists due to an incomplete fix for CVE-2023-47627. Version 3.9.2 fixes this v

OSV

CVE-2023-47627: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python

osv·2023-11-14·CVSS 7.5

CVE-2023-47627 [HIGH] CVE-2023-47627: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python 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.

OSV

AIOHTTP has problems in HTTP parser (the python one, not llhttp)

osv·2023-11-14

CVE-2023-47627 [MEDIUM] AIOHTTP has problems in HTTP parser (the python one, not llhttp) AIOHTTP has problems in HTTP parser (the python one, not llhttp) # Summary 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). # Details ## Bug 1: Bad parsing of `Content-Length` values ### Description RFC 9110 says this: > `Content-Length = 1*DIGIT` AIOHTTP does not enforce this rule, presumably because of an incorrect usage of the builtin `int` constructor. Because the `int` constructor accepts `+` and `-` prefixes, and digit-separating underscores, using `int` to parse CL values leads AIOHTTP to significant misinterpretation. ### Examples ``` GET / HTTP/1.1\r\n Content-Length: -0\r\n \r\n X ``` ``` GET / HTTP/1.1\r\n Content-Len

GHSA

AIOHTTP has problems in HTTP parser (the python one, not llhttp)

ghsa·2023-11-14

CVE-2023-47627 [MEDIUM] CWE-444 AIOHTTP has problems in HTTP parser (the python one, not llhttp) AIOHTTP has problems in HTTP parser (the python one, not llhttp) # Summary 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). # Details ## Bug 1: Bad parsing of `Content-Length` values ### Description RFC 9110 says this: > `Content-Length = 1*DIGIT` AIOHTTP does not enforce this rule, presumably because of an incorrect usage of the builtin `int` constructor. Because the `int` constructor accepts `+` and `-` prefixes, and digit-separating underscores, using `int` to parse CL values leads AIOHTTP to significant misinterpretation. ### Examples ``` GET / HTTP/1.1\r\n Content-Length: -0\r\n \r\n X ``` ``` GET / HTTP/1.1\r\n Content-Len

Ubuntu

AIOHTTP vulnerabilities

vendor_ubuntu·2025-07-17·CVSS 5.3

CVE-2023-49082 [MEDIUM] AIOHTTP vulnerabilities Title: AIOHTTP vulnerabilities Summary: Several security issues were fixed in AIOHTTP. Ben Kallus discovered that AIOHTTP did not correctly parse HTTP headers. A remote attacker could possibly use this issue to perform request smuggling. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-47627) Ivan Novikov discovered that AIOHTTP did not properly validate certain inputs. A remote attacker could possibly use this issue to perform request smuggling. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-49081, CVE-2023-49082) Paul J. Dorn discovered that AIOHTTP did not properly validate certain inputs. A remote attacker could possibly use this issue to perform request smuggling. This issue only affected Ubuntu 20.04 LTS, Ubunt

Oracle

Oracle Oracle Siebel CRM Risk Matrix: Siebel Cloud Manager (AIOHTTP) — CVE-2023-47627

vendor_oracle·2024-07-15·CVSS 7.5

CVE-2023-47627 [MEDIUM] Oracle Oracle Siebel CRM Risk Matrix: Siebel Cloud Manager (AIOHTTP) — CVE-2023-47627 Oracle Oracle Siebel CRM Risk Matrix: Siebel Cloud Manager (AIOHTTP) vulnerability CVE: CVE-2023-47627 CVSS: 7.5 Protocol: HTTP Remote exploit: Yes Affected versions: Network Advisory: cpujul2024 (JUL 2024)

Red Hat

python-aiohttp: http request smuggling

vendor_redhat·2024-01-30·CVSS 5.3

CVE-2024-23829 [MEDIUM] CWE-444 python-aiohttp: http request smuggling python-aiohttp: http request smuggling aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Security-sensitive parts of the Python HTTP parser retained minor differences in allowable character sets, that must trigger error handling to robustly match frame boundaries of proxies in order to protect against injection of additional requests. Additionally, validation could trigger exceptions that were not handled consistently with processing of other malformed input. Being more lenient than internet standards require could, depending on deployment environment, assist in request smuggling. The unhandled exception could cause excessive resource consumption on the application server and/or its logging facilities. This vulnerability exists due to an incomplete fix for CV

Debian

CVE-2024-23829: python-aiohttp - aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. ...

vendor_debian·2024·CVSS 5.3

CVE-2024-23829 [MEDIUM] CVE-2024-23829: python-aiohttp - aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. ... aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Security-sensitive parts of the Python HTTP parser retained minor differences in allowable character sets, that must trigger error handling to robustly match frame boundaries of proxies in order to protect against injection of additional requests. Additionally, validation could trigger exceptions that were not handled consistently with processing of other malformed input. Being more lenient than internet standards require could, depending on deployment environment, assist in request smuggling. The unhandled exception could cause excessive resource consumption on the application server and/or its logging facilities. This vulnerability exists due to an incomplete fix for CVE-2023-47627. Version 3.9.2 fixes this v

Red Hat

python-aiohttp: numerous issues in HTTP parser with header parsing

vendor_redhat·2023-11-15·CVSS 5.3

CVE-2023-47627 [MEDIUM] CWE-444 python-aiohttp: numerous issues in HTTP parser with header parsing python-aiohttp: numerous issues in HTTP parser with header parsing 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. An HTTP request smuggling vulnerability was found in aiohttp. Numerous issues with HTTP parsing can allow an attacker to smuggle HTTP requests. Package: ansible-tower (Red Hat Ansible Automation Platform 1.2) - Not affected Package: ansible-automation-platform-2

Microsoft

Request smuggling in aiohttp

vendor_msrc·2023-11-14·CVSS 7.5

CVE-2023-47627 [MEDIUM] CWE-444 Request smuggling in aiohttp Request smuggling in aiohttp FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability? One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this. Mariner: Mariner GitHub_M: GitHub_M Customer Action Required: Yes

Debian

CVE-2023-47627: python-aiohttp - aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. ...

vendor_debian·2023·CVSS 5.3

CVE-2023-47627 [MEDIUM] CVE-2023-47627: python-aiohttp - aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. ... 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. Scope: local bookworm: resolved (fixed in 3.8.4-1+deb12u1) bullseye: resolved (fixed in 3.7.4-1+deb11u1) forky: resolved (fixed in 3.8.6-1) sid: resolved (fixed in 3.8.6-1) trixie: resolved (fixed in 3.8.6-1)

CVE-2023-47627: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which…

Affected

CVSS provenance