CVE-2026-109366

The Zebra software, prior to version 6.4.0 , is vulnerable to an improper integrity validation flaw in the inbound gossip download path. This allows unauthenticated peers to force the dropping of new blocks without penalty by serving a real block with a rewritten coinbase scriptSig set to height ...

CVE-2026-109366 Zebra before 6.4.0 Gossiped Block Drop via Forged Coinbase scriptSig Height

Zebra before 6.4.0 contains an improper integrity validation vulnerability in the inbound gossip download path that allows unauthenticated peers to force dropping of new blocks without penalty. Attackers can serve a real block with a coinbase scriptSig rewritten to height 1, which keeps the ZIP-2...