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 …
Published: 2026-10-12 · CVSS: 6.3 · CVSS 4.0
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-244 block hash, triggering a behind-tip drop before consensus validation and delaying tip discovery for mining backends.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7