CVE-2026-58050

CVE-2026-58050 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.