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Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M

CVE-2026-54274AIOHTTP: Incomplete websocket frame payloads bypass memory limits

Medium 6.6

In plain English

A medium-severity resource allocation without limits in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.6Medium
Exploit odds (30 days)0.5%top 54.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use. This vulnerability is fixed in 3.14.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12python-aiohttp3.8.4-1+deb12u2DEBIAN-CVE-2026-54274
Debian:13python-aiohttpno fix listedDEBIAN-CVE-2026-54274
Debian:14python-aiohttp3.14.1-1DEBIAN-CVE-2026-54274
PyPIaiohttp3.14.1PYSEC-2026-2108
PyPIaiohttp3.14.1GHSA-xcgm-r5h9-7989
Ubuntu:25.10python-aiohttpno fix listedUBUNTU-CVE-2026-54274
Ubuntu:26.10python-aiohttpno fix listedUBUNTU-CVE-2026-54274

Affected products (as reported)

VendorProductVersions
aio-libs aiohttp < 3.14.1

Weakness: CWE-770 · Vector: 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

References