CVE-2026-22815
aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage
EPSS 0.02%
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, insufficient restrictions in header/trailer handling could cause uncapped memory usage. This issue has been patched in version 3.13.4.
How to fix CVE-2026-22815
To remediate CVE-2026-22815, upgrade the affected package to a fixed version below.
- Debian/python-aiohttp—no fix listed
- PyPI/aiohttp—upgrade to 3.13.4 or later
Is CVE-2026-22815 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- from 0, < 3.13.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |