This update for mbedtls fixes the following issues:

- CVE-2018-0487: Fixed a buffer overflow in RSASSA-PSS signature
  verification, which allowed remote attackers to execute arbitrary code or
  cause a denial of service via a crafted certificate chain. (boo#1080826)
- CVE-2018-0488: Fixed a heap vulnerability, which allowed remote
  attackers to execute arbitrary code or cause a DoS via a crafted application
  packet when the truncated HMAC extension and CBC are used. (boo#1080828)
- CVE-2017-18187: Fixed bound check in ssl_parse_client_psk_identity(), which
  might lead to an overflow. (boo#1080973)