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CVE-2026-109366 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CNA: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4f6v-mj46-gxg3	CISA-ADP	AdvisoryExploitVendor
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4f6v-mj46-gxg3	[email protected]	AdvisoryExploitVendor
https://www.vulncheck.com/advisories/zebra-before-6.4.0-gossiped-block-drop-via-forged-coinbase-scriptsig-height	[email protected]	AdvisoryVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-354	Improper Validation of Integrity Check Value	[email protected]

Affected Products

Product	Versions
ZcashFoundation Zebra	<= 6.3.0 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 6.4.2moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 26, 2026	CVE Modified	CISA-ADP
Oct 12, 2026	New CVE Received	[email protected]