ssh not working after upgrade from Intrepid to Jaunty

ssh is not working any more after upgrade from Intrepid to Jaunty (latest development branch; February 12, 2009). Error message is: "buffer_get_ret: trying to get more bytes 4 than in buffer 0
buffer_get_int: buffer error"

openssh package version: 1:5.1p1-5ubuntu1

Output of "ssh -v 132.252.xxx.xxx":
OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 132.252.xxx.xxx [132.252.xxx.xxx] port 22.
debug1: Connection established.
debug1: identity file /home/dreibh/.ssh/identity type -1
debug1: identity file /home/dreibh/.ssh/id_rsa type -1
debug1: identity file /home/dreibh/.ssh/id_dsa type 2
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.6p1 Debian-5ubuntu0.6
debug1: match: OpenSSH_4.6p1 Debian-5ubuntu0.6 pat OpenSSH_4*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '132.252.xxx.xxx' is known and matches the RSA host key.
debug1: Found key in /home/dreibh/.ssh/known_hosts:208
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
buffer_get_ret: trying to get more bytes 4 than in buffer 0
buffer_get_int: buffer error