[REQUIRED] Step 1: Describe your environment

• Xcode version: 12.0
• Firebase SDK version: 7.2.0
• Installation method: CocoaPods
• Firebase Component: nanopb

[REQUIRED] Step 2: Describe the problem

CVE-2020-26243 "nanopb: oneof fields with PB_ENABLE_MALLOC can leak memory" was reported on Nov. 11 and fixed on Nov. 26 upstream in 0.3.9.7.

Steps to reproduce:

• Install Firebase 7.2.0
• Observe that Google's mirror of nanopb uses 2.30906.0 (which equates to nanopb 0.3.9.6)