Vulnerability Details CVE-2026-58050
libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 22.8%
CVSS Severity
CVSS v3 Score 7.0
References
Products affected by CVE-2026-58050
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cpe:2.3:a:libssh2:libssh2:-
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cpe:2.3:a:libssh2:libssh2:0.1
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cpe:2.3:a:libssh2:libssh2:0.10
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cpe:2.3:a:libssh2:libssh2:0.11
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cpe:2.3:a:libssh2:libssh2:0.12
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cpe:2.3:a:libssh2:libssh2:0.13
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cpe:2.3:a:libssh2:libssh2:0.14
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cpe:2.3:a:libssh2:libssh2:0.15
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cpe:2.3:a:libssh2:libssh2:0.16
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cpe:2.3:a:libssh2:libssh2:0.17
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cpe:2.3:a:libssh2:libssh2:0.18
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cpe:2.3:a:libssh2:libssh2:0.3
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cpe:2.3:a:libssh2:libssh2:0.5
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cpe:2.3:a:libssh2:libssh2:0.6
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cpe:2.3:a:libssh2:libssh2:0.7
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cpe:2.3:a:libssh2:libssh2:0.8
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cpe:2.3:a:libssh2:libssh2:1.0
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cpe:2.3:a:libssh2:libssh2:1.1
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cpe:2.3:a:libssh2:libssh2:1.10.0
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cpe:2.3:a:libssh2:libssh2:1.2
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cpe:2.3:a:libssh2:libssh2:1.2.1
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cpe:2.3:a:libssh2:libssh2:1.2.2
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cpe:2.3:a:libssh2:libssh2:1.2.3
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cpe:2.3:a:libssh2:libssh2:1.2.4
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cpe:2.3:a:libssh2:libssh2:1.2.5
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cpe:2.3:a:libssh2:libssh2:1.2.6
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cpe:2.3:a:libssh2:libssh2:1.2.7
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cpe:2.3:a:libssh2:libssh2:1.2.8
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cpe:2.3:a:libssh2:libssh2:1.2.9
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cpe:2.3:a:libssh2:libssh2:1.3.0
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cpe:2.3:a:libssh2:libssh2:1.4.0
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cpe:2.3:a:libssh2:libssh2:1.4.1
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cpe:2.3:a:libssh2:libssh2:1.4.2
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cpe:2.3:a:libssh2:libssh2:1.4.3
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cpe:2.3:a:libssh2:libssh2:1.5.0
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cpe:2.3:a:libssh2:libssh2:1.6.0
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cpe:2.3:a:libssh2:libssh2:1.7.0
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cpe:2.3:a:libssh2:libssh2:1.8.0
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cpe:2.3:a:libssh2:libssh2:1.8.1
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cpe:2.3:a:libssh2:libssh2:1.8.2
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cpe:2.3:a:libssh2:libssh2:1.9.0