GHSA-JJ3X-WXRX-4X23
Vulnerability from github – Published: 2026-01-05 23:10 – Updated: 2026-01-06 16:06Summary
When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body.
Impact
If optimisations 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.
Patch: https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 3.13.2"
},
"package": {
"ecosystem": "PyPI",
"name": "aiohttp"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.13.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-69227"
],
"database_specific": {
"cwe_ids": [
"CWE-835"
],
"github_reviewed": true,
"github_reviewed_at": "2026-01-05T23:10:15Z",
"nvd_published_at": "2026-01-06T00:15:48Z",
"severity": "MODERATE"
},
"details": "### Summary\nWhen assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body.\n\n### Impact\nIf optimisations 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.\n\n------\n\nPatch: https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259",
"id": "GHSA-jj3x-wxrx-4x23",
"modified": "2026-01-06T16:06:51Z",
"published": "2026-01-05T23:10:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jj3x-wxrx-4x23"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-69227"
},
{
"type": "WEB",
"url": "https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259"
},
{
"type": "PACKAGE",
"url": "https://github.com/aio-libs/aiohttp"
}
],
"schema_version": "1.4.0",
"severity": [
{
"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",
"type": "CVSS_V4"
}
],
"summary": "AIOHTTP vulnerable to DoS when bypassing asserts"
}
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