CVE-2026-104435

Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output

State: Published
Severity: 8.3 High
Published: Oct 2, 2026
Updated: Oct 2, 2026
Reserved: Oct 2, 2026

Description

Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inputs than outputs that Zebra accepts but zcashd rejects, causing a network consensus split.

Scores

CVSS	Score	Vector	Source
4.0	8.3 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H	VulnCheck

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
zebraZcashFoundation	4.4.0 to before 4.4.1Affected 4.4.1Not affected
zebraZcashFoundation	6.0.0 to before 6.0.1Affected 6.0.1Not affected

References

GitHub Security Advisory (GHSA-pvmv-cwg8-v6c8)vendor-advisory
VulnCheck Advisory: Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Outputthird-party-advisory

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