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  4. CVE 2026 104435 zebra 440 consensus divergence via v5
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Back to active CVEs
High · CVSS 8.3CVE-2026-104435

Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output

Answer in brief

CVE-2026-104435 records a High severity (CVSS 8.3) vulnerability in Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output. The current sources do not mark it as known exploited. The current feed maps ZcashFoundation/zebra (generic), ZcashFoundation/zebra (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 2, 2026Updated Oct 2, 2026Source checked Oct 2, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ZcashFoundation/zebra (generic), ZcashFoundation/zebra (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ZcashFoundation/zebrageneric>=4.4.0 <4.4.14.4.1
ZcashFoundation/zebrageneric>=6.0.0 <6.0.16.0.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ZcashFoundation/zebra, ZcashFoundation/zebra.
  2. 2Review the reported fix. Update ZcashFoundation/zebra to 4.4.1; ZcashFoundation/zebra to 6.0.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-347
Source
CVE List V5
Source checked
Oct 2, 2026
References
2 linked sources
Open source record