The 1.5.2, fixes a security vulnerability found on consensus
Vulnerability involve Validators accepting as valid, a block without AggregatedParentSeal field on the header. This issue would generate consensus on an invalid block that later will be rejected the all full nodes. And quite probably stall the network. But safety of the network is not compromised.
- The fix and details on it can be found on #1830
Docker Images
geth: us.gcr.io/celo-org/geth:1.5.2
geth-all: us.gcr.io/celo-org/geth-all:1.5.2