Security information

The MKE 3.6.14 patch release focuses exclusively on CVE mitigation. To this end, the following middleware component versions have been upgraded to resolve vulnerabilities in MKE:

  • [MKE-11477] cri-dockerd 0.3.13

  • [MKE-11404] Interlock 3.3.13

  • [MKE-11482] Blackbox Exporter 0.25.0

  • [MKE-11482] Alert Manager 0.27.0

The following table details the specific CVEs addressed, including which images are affected per CVE.



Image mitigated

Problem details from upstream



  • ucp-sf-notifier

Internationalized Domain Names in Applications (IDNA) vulnerable to denial of service from specially crafted inputs to idna.encode



  • ucp-interlock

  • ucp-interlock-extension

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request’s headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.