Vulnerability DatabaseCVE-2026-109365
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CVE-2026-109365
Published:October 12, 2026
Updated:October 13, 2026
Zebra before 6.4.0 contains an uncontrolled resource consumption vulnerability that allows unauthenticated peers to force full proof verification by serving forged block bodies with valid header hashes. Attackers can flip authorizing-only bytes such as a coinbase scriptSig, wasting Sapling, Orchard, and Ironwood proof verification without penalty and stalling sync for 67 seconds.
Affected Packages
zebrad (RUST):
Affected version(s) =6.3.0 <6.4.0
Fix Suggestion:
Update to version 6.4.0
Related Resources (4)
https://www.vulncheck.com/advisories/zebra-before-6.4.0-denial-of-service-via-same-hash-forged-block-bodies
https://nvd.nist.gov/vuln/detail/CVE-2026-109365
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3c94-hf7p-g5mf
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109365.json
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Insufficient Verification of Data Authenticity
CWE-345
EPSS
Base Score:
0.15