Medium
Request smuggling in aiohttp
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-47627
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 02:05 UTC · Revision 1
Source evidence
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:CVE-2023-47627
Complete source record
{
"id": "136cf9b3438ed9c56a7058089e175605ba813a82380bb30de9fc8047fe7e1923",
"url": "https://osv.dev/vulnerability/CVE-2023-47627",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Request smuggling in aiohttp",
"summary": "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.",
"evidence": "osv:CVE-2023-47627",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2023-47627",
"aliases": [
"CVE-2023-47627",
"GHSA-gfw2-4jvh-wgfg",
"PYSEC-2023-246"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/aio-libs/aiohttp",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "996de2629ef6b4c2934a7c04dfd49d0950d4c43b"
},
{
"fixed": "d5c12ba890557a575c313bb3017910d7616fce3d"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.8.6"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "d5c12ba890557a575c313bb3017910d7616fce3d"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"v3.8.4",
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"2.0.0",
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"1.3.0",
"v1.2.0",
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"v1.1.0",
"v1.0.1",
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"v0.22.1",
"v0.22.0",
"v0.22.0b6",
"v0.22.0b5",
"v0.22.0b4",
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"4v0.21.6",
"v0.21.0",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-47627.json"
}
}
],
"modified": "2026-10-28T02:30:53.110409373Z",
"provider": "osv",
"references": [
"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/",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/47xxx/CVE-2023-47627.json",
"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg",
"https://nvd.nist.gov/vuln/detail/CVE-2023-47627",
"https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d"
],
"provider_metadata": {
"cwe_ids": [
"CWE-444"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/47xxx/CVE-2023-47627.json"
}
},
"related_cves": [
{
"value": "CVE-2023-47627",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 521614,
"published_at": "2023-11-14T20:48:48.076+00:00"
}