CVE-2012-4561: Libssh

Medium severity, CVSS 5.0. EPSS: 4.8% chance of exploitation in the next 30 days.

The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors.

Affected products

• Libssh Libssh: up to and including 0.5.2; version 0.4.7 only; version 0.4.8 only; version 0.5.0 only; version 0.5.1 only

Published 2012-11-30. Last modified 2026-06-16.