October 28, 2026
- VerCellBreak defeats Vercel Sandbox egress whitelisting without the sandbox ever talking to the attacker: a hijacked agent presents a forged mTLS client certificate whose AIA extension URL encodes the data, and the trusted whitelisted server fetches that URL itself while building the chain. Four conditions must hold — whitelisted egress, a controlled agent, a whitelisted domain requiring mTLS, and a server that resolves AIA. AIR Security disclosed it on 12 October and has no evidence of in-the-wild use (NSFOCUS). · AI & Agent Security
in Pre-Boot RCE in EDK2 Breaks Cover Months Before Its Disclosure Date