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CVE-2026-58051 is a memory-safety vulnerability in libssh2 through version 1.11.1 affecting client-side handling of the SSH publickey subsystem. When libssh2 expands its internal publickey list using reallocation, newly added entries are not zero-initialized before parser population occurs. If parsing of a server-supplied publickey response fails before the new entry is fully initialized, execution can reach the cleanup path with partially or wholly uninitialized list elements still present. During cleanup, libssh2_publickey_list_free may operate on such an uninitialized entry and attempt to free an uninitialized, attacker-influenceable attrs pointer. A malicious SSH server that offers the publickey subsystem can trigger this condition by returning a malformed response to a connecting libssh2 client.
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No public exploit code observed for this vulnerability.
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13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in libssh2 during publickey list cleanup caused by freeing an uninitialized pointer.
A memory corruption vulnerability in libssh2 through 1.11.1 caused by failure to zero-initialize newly reallocated publickey list entries, allowing a malicious SSH server to trigger cleanup on an uninitialized attacker-influenceable pointer in a connecting client.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.