High 7.5Published Jun 22, 2026

CVE-2026-54280AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.

Updated under an hour ago (2026-10-19 06:30 UTC)

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It affects aiohttp. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, payload resources are not closed correctly when a client disconnects in the middle of a write. If a payload is using an open file or similar limited resource, then an attacker may be able to cause resource starvation temporarily until garbage collection or similar closes the file. This vulnerability is fixed in 3.14.1.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-404
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Sep 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

aiohttp aiohttp aiohttp:aiohttp	from 3.12.1 before 3.14.1	NVD

References

https://github.com/aio-libs/aiohttp/commit/a762eda5242f6490d6ba667533193f8b473ad587patch
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9x8q-7h8h-wcw9third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.