Unprotected Alternate Channel Affecting openssh-portable package, versions [,10.3)
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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- published7 Apr 2026
- disclosed2 Apr 2026
- creditMichalis Vasileiadis
Introduced: 2 Apr 2026
CVE-2026-35388 (opens in a new tab)How to fix?
Upgrade openssh-portable to version 10.3 or higher.
Overview
Affected versions of this package are vulnerable to Unprotected Alternate Channel due to the omission of confirmation in proxy-mode multiplexing sessions. An attacker can cause unintended data handling by establishing a multiplexed session without explicit confirmation when specific and complex conditions are met that require user interaction.