Infinite loop Affecting asyncssh package, versions [,2.24.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-ASYNCSSH-19883914
- published17 Sept 2026
- disclosed16 Sept 2026
- creditzhangph
Introduced: 16 Sep 2026
NewCVE-2026-62949 (opens in a new tab)How to fix?
Upgrade asyncssh to version 2.24.0 or higher.
Overview
Affected versions of this package are vulnerable to Infinite loop in the SSH_MSG_CHANNEL_OPEN and SSH_MSG_CHANNEL_OPEN_CONFIRMATION. An attacker can cause the asyncio event loop to freeze by supplying a send_pktsize value of zero, which leads to an infinite loop that prevents further processing of connections.