CVE-2026-123555
Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.
| CWE | CWE-755 |
| Vendor | zcashfoundation |
| Product | zebra |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ZcashFoundation / zebra
2.3.0 < 7.0.0
ZcashFoundation / zebra
1.0.0-beta.46 < 18.0.0
References
github.com: https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jq45-ghw5-v37x github.com: https://github.com/ZcashFoundation/zebra/commit/e8db87eb69254e0d4eedd058eadd48bdfa09065a vulncheck.com: https://www.vulncheck.com/advisories/zebra-2.3.0-before-7.0.0-denial-of-service-via-unscored-script-verification-failures
Credits
🔍 x15-eth mpguerra conradoplg upbqdn