CVE-2026-58050

Description

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.

Weakness classification

• disclosure@vulncheck.com: CWE-190

Primary references

• disclosure@vulncheck.com — Broken Link
• disclosure@vulncheck.com — Product
• disclosure@vulncheck.com — Third Party Advisory