Vulnerability in Zcashfoundation Zebra
CVE-2026-104425
ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion vulnerability that allows unauthenticated peers to degrade block processing by pushing transactions with invalid Orchard proofs without being misbehavior-scored. Attackers can repeatedly push invalid proofs into the shared halo2 batch verifier, forcing honest block proofs onto the slow individual-verification path and slowing block processing roughly sevenfold.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-g7c4-2w6c-cr3r) (vendor-advisory)
- VulnCheck Advisory: Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed Transactions (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104425?
- CVE-2026-104425 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Asymmetric Resource Consumption (Amplification). CVSS score: 5.3/10. Published 2026-10-02.
- How severe is CVE-2026-104425?
- Medium severity. CVSS v3 base score is 5.3 out of 10.