CVE-2024-23829 — HTTP Request Smuggling in Aiohttp

Vendor	Product	Version range	Fixed in
aiohttp	aiohttp	< 3.9.2	3.9.2
aiohttp	aiohttp	>= 0 < 3.9.2	3.9.2
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

GHSA

aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators

ghsa·2024-01-29

CVE-2024-23829 [MEDIUM] CWE-444 aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators ### Summary 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. ### Details These problems are rooted in pattern matching protocol elements, previously improved by PR #3235 and GHSA-gfw2-4jvh-wgfg: 1. The expression `HTTP/(\d).(\d)` lacked another backslash to clarify that the separator should be a literal dot, not just *any* Unicode code point (result: `HTTP/(\d)\.(\d)`). 2. The

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

aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators

osv·2024-01-29

CVE-2024-23829 [MEDIUM] aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators ### Summary 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. ### Details These problems are rooted in pattern matching protocol elements, previously improved by PR #3235 and GHSA-gfw2-4jvh-wgfg: 1. The expression `HTTP/(\d).(\d)` lacked another backslash to clarify that the separator should be a literal dot, not just *any* Unicode code point (result: `HTTP/(\d)\.(\d)`). 2. The

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

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

Microsoft

aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators

vendor_msrc·2024-01-09·CVSS 6.5

CVE-2024-23829 [MEDIUM] CWE-444 aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators 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-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

CVE-2024-23829: aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Security-sensitive parts of the Python HTTP parser retained minor differences…

Affected

CVSS provenance