SEPTEMBER 19, 2026
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Case File

CVE-2026-59881

MEDIUM · CVSS 6.9 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-30 · Last synced 2026-08-29

CyberRota Analysis

AI-Generated

The AIOHTTP framework prior to version 3.14.2 is vulnerable to a denial-of-service attack via its WebSocket client, which improperly handles frames with the RSV1 bit set, leading to potential CPU and memory exhaustion. This vulnerability can be exploited by a malicious server to degrade the performance of affected applications. Developers and organizations utilizing AIOHTTP for WebSocket communications should prioritize upgrading to version 3.14.2 to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-59881
Severity
MEDIUM
CVSS
6.9
EPSS
0.30%

Original NVD Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.