CVE-2012-4559: Libssh

Medium severity, CVSS 6.8. EPSS: 5.2% chance of exploitation in the next 30 days.

Multiple double free vulnerabilities in the (1) agent_sign_data function in agent.c, (2) channel_request function in channels.c, (3) ssh_userauth_pubkey function in auth.c, (4) sftp_parse_attr_3 function in sftp.c, and (5) try_publickey_from_file function in keyfiles.c in libssh before 0.5.3 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code 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.