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CVE-2026-59846 is an information disclosure and command-injection flaw in libssh's ProxyCommand handling. When a ProxyCommand string contains the %r placeholder, libssh expands it using the configured username. If that username is attacker-controlled and contains shell metacharacters, the expanded value can be interpreted by the shell rather than treated as inert data. This can lead to shell metacharacter injection during ProxyCommand execution, causing unintended shell behavior and exposing environment-derived information. The issue affects libssh releases prior to the fixed security versions and was addressed in libssh 0.12.1 and backported to the 0.11 branch in 0.11.5.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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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.