CVE-2026-109366

LowCVSS 3.7/10Last modified Oct 16, 2026

Description

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.

Metrics

CVSS 3.1 3.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-354

Affected software

No affected versions have been published.

Timeline

Published: Oct 12, 2026
Last modified: Oct 16, 2026
NVD status: Deferred

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