Medium
AIOHTTP vulnerable to DoS when bypassing asserts
Type: advisorySources: OSV
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-69227
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 01:13 UTC · Revision 1
Source evidence
AIOHTTP vulnerable to DoS when bypassing asserts
core-osv · Original sourcePublished 5 Jan 2026, 23:19 UTC
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
osv:CVE-2025-69227
Complete source record
{
"id": "abbe2856a8c7296ab7256b0c03ad5bca4ecf6845d078355d98640d94d6e8037c",
"url": "https://osv.dev/vulnerability/CVE-2025-69227",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "AIOHTTP vulnerable to DoS when bypassing asserts",
"summary": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.",
"evidence": "osv:CVE-2025-69227",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-69227",
"aliases": [
"CVE-2025-69227",
"GHSA-jj3x-wxrx-4x23",
"PYSEC-2026-1107"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/aio-libs/aiohttp",
"type": "GIT",
"events": [
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"introduced": "0"
},
{
"fixed": "41f01ed680b7efc8f97677df45731b80328aad6c"
},
{
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}
],
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"source": "CPE_RANGE"
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{
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"source": "REFERENCES_COMMIT"
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-69227.json"
}
}
],
"modified": "2026-10-28T02:30:32.319429851Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/69xxx/CVE-2025-69227.json",
"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jj3x-wxrx-4x23",
"https://nvd.nist.gov/vuln/detail/CVE-2025-69227",
"https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259"
],
"provider_metadata": {
"cwe_ids": [
"CWE-835"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/69xxx/CVE-2025-69227.json"
}
},
"related_cves": [
{
"value": "CVE-2025-69227",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 499411,
"published_at": "2026-01-05T23:19:31.396+00:00"
}