CVE-2026-104425

Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed Transactions

State: Published
Severity: 6.9 Medium
Published: Oct 2, 2026
Updated: Oct 2, 2026
Reserved: Oct 2, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	VulnCheck

Weaknesses

CWE-405 Asymmetric Resource Consumption (Amplification)

Affected Products

Product	Versions
zebraZcashFoundation	before 6.1.0Affected 6.1.0Not affected

References

GitHub Security Advisory (GHSA-g7c4-2w6c-cr3r)vendor-advisory
VulnCheck Advisory: Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed Transactionsthird-party-advisory

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