Low
AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields
Type: advisorySources: OSV
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-69225
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 00:54 UTC · Revision 1
Source evidence
AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields
core-osv · Original sourcePublished 5 Jan 2026, 23:16 UTC
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.
osv:CVE-2025-69225
Complete source record
{
"id": "7de711355f4eaab2cd0d9570e0c1fcb00890e28ca6948c190df1ab8f444f6c13",
"url": "https://osv.dev/vulnerability/CVE-2025-69225",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields",
"summary": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.",
"evidence": "osv:CVE-2025-69225",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2025-69225",
"aliases": [
"CVE-2025-69225",
"GHSA-mqqc-3gqh-h2x8",
"PYSEC-2026-1109"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/aio-libs/aiohttp",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "41f01ed680b7efc8f97677df45731b80328aad6c"
},
{
"fixed": "c7b7a044f88c71cefda95ec75cdcfaa4792b3b96"
}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*",
"range": [
{
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},
{
"fixed": "3.13.3"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "c7b7a044f88c71cefda95ec75cdcfaa4792b3b96"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-69225.json"
}
}
],
"modified": "2026-10-28T02:30:52.546109770Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/69xxx/CVE-2025-69225.json",
"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mqqc-3gqh-h2x8",
"https://nvd.nist.gov/vuln/detail/CVE-2025-69225",
"https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96"
],
"provider_metadata": {
"cwe_ids": [
"CWE-444"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/69xxx/CVE-2025-69225.json"
}
},
"related_cves": [
{
"value": "CVE-2025-69225",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 521130,
"published_at": "2026-01-05T23:16:19.158+00:00"
}