CVE-2026-54274 aio-libs CVE debrief

Who should care

Defenders of applications using AIOHTTP should review their inventory and ensure they are using version 3.14.1 or later to mitigate this vulnerability. This is particularly important for those with exposure to untrusted WebSocket connections. Monitoring for unusual memory usage patterns in AIOHTTP applications may also be warranted.

Technical summary

CVE-2026-54274 is a vulnerability in AIOHTTP's handling of WebSocket frame payloads. When an attacker sends large incomplete WebSocket frame payloads, it may be possible to bypass the usual size limits on memory use. This could potentially lead to memory exhaustion attacks. The vulnerability is fixed in AIOHTTP version 3.14.1. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 6.6, indicating a medium severity level. The CVSS vector is 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Defensive priority

Defenders should prioritize updating AIOHTTP to version 3.14.1 or later. Monitoring for unusual memory usage patterns in AIOHTTP applications may also be warranted.

Recommended defensive actions

• Update AIOHTTP to version 3.14.1 or later
• Review application inventory for AIOHTTP usage
• Monitor AIOHTTP applications for unusual memory usage patterns
• Consider implementing WebSocket connection rate limiting
• Implement additional memory usage monitoring for AIOHTTP applications

Evidence notes

The CVE-2026-54274 vulnerability was identified in the AIOHTTP library. The vulnerability allows for a potential bypass of memory use size limits through large incomplete WebSocket frame payloads. The issue has been fixed in version 3.14.1. Evidence from the NVD and CVE.org confirms the details of this vulnerability.

Official resources