Babylon contributor discloses vulnerability in BLS voting extension mechanism, affecting versions prior to 4.2.0

Foresight News reported that, according to a Babylon GitHub post, contributor @GrumpyLaurie55348 disclosed on December 9, 2025, that there is a vulnerability in Babylon's BLS voting extension handling mechanism, which could allow malicious validators to cause disruptions during the network consensus process. Attackers could deliberately omit the block hash field when sending blocks, causing other validators to crash at the network epoch boundary, thereby slowing down block production. The severity of this vulnerability has been rated as high, affecting versions prior to 4.2.0. Currently, there have been no user reports of this vulnerability being exploited.