During cleanup it is possible for a compressed request body to be decompressed into memory in one chunk.
An attacker may be able to send a compressed payload in specific situations that could be decompressed into memory, potentially leading to DoS (a zip bomb edge case).
Disable compression if unable to upgrade.
Patch: https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232
{
"nvd_published_at": null,
"github_reviewed_at": "2026-06-15T20:09:51Z",
"github_reviewed": true,
"severity": "MODERATE",
"cwe_ids": [
"CWE-409"
]
}