Integer Overflow in libssh2 publickey subsystem attribute allocation
CVE-2026-58050 is a memory corruption vulnerability in libssh2 through 1.11.1 in the client-side handling of publickey-subsystem responses. libssh2 reads an attacker-controlled 32-bit attribute count from a server response and uses that value in the allocation expression num_attrs * sizeof(libssh2_publickey_attribute) without adequate bounds checking. On 32-bit platforms, this multiplication can overflow, resulting in an undersized heap allocation. A malicious SSH server can then cause the subsequent attribute-parsing loop to write beyond the allocated buffer, producing a heap buffer overflow in the connecting libssh2 client.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
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The version that knows your environment.
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.