CVE-2026-58050: LIBSSH2

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• LIBSSH2 LIBSSH2: up to and including 1.11.1

Published 2026-06-28. Last modified 2026-06-30.