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CVE-2026-35388 is a vulnerability in OpenSSH ssh(1) before version 10.3 affecting connection multiplexing in proxy mode. When multiplexing confirmation is configured via ControlMaster ask or ControlMaster autoask, the client fails to enforce the expected confirmation check for proxy-mode multiplexing sessions invoked with proxy operations. As a result, proxy-mode multiplexing sessions can proceed without the user confirmation that administrators or users may expect from the configured multiplexing policy. The issue affects ssh client-side handling of multiplexed control connections rather than server-side authentication logic, and OpenSSH 10.3 corrects the confirmation handling for proxy-mode sessions.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.