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CVE-2026-35386 is a command execution vulnerability in OpenSSH ssh(1) before version 10.3. The flaw is caused by validation of shell metacharacters in a username supplied on the command line occurring too late. In affected configurations, an attacker-controlled username can be expanded through ssh_config processing, specifically in scenarios using a non-default Match exec configuration with the %u token, allowing shell metacharacters embedded in the username to influence command execution. The issue affects ssh client-side invocation rather than sshd server-side authentication logic.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
8 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.