A threat cluster dubbed CylindricalCanine, attributed as a sub-group of the Chinese cybercrime actor GoldenEyeDog (aka APT-Q-27, Dragon Breath, Miuuti Group), was linked to the April 2026 breach of certificate authority DigiCert and the theft of code-signing certificates. Stolen certificates can be used to sign malware so it appears trusted, enabling supply-chain compromise across downstream software consumers.
Updated Jul 19, 2026