A flaw was found in libssh server-side GSSAPIKeyExchange authorization. In sshpacketuserauthrequest() in src/messages.c, the gssapi-keyex login path granted success after Kerberos authentication without dispatching the callback that verifies whether the authenticated principal is authorized for the requested local user. On servers with GSSAPIKeyExchange enabled, an authenticated client can therefore log in as an arbitrary local user if the missing principal-to-user authorization check is relied upon for access control.

A flaw was found in the gdk-pixbuf library. This heap-based buffer overflow vulnerability occurs in the JPEG image loader due to improper validation of color component counts when processing a specially crafted JPEG image. A remote attacker can exploit this flaw without user interaction, for example, via thumbnail generation. Successful exploitation leads to application crashes and denial of service (DoS) conditions.