-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

0xCERT Security Advisory 0xCERT-2026-0190
============================================================

Advisory-ID:  0xCERT-2026-0190
Severity:     Critical
Published:    2026-04-18T01:15:24.000Z
Updated:      2026-10-08T22:47:28.907Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0190

Title: Zebra Vulnerable to Consensus Divergence in Transparent Sighash Hash-Type Handling

Summary
- -------
Zebra Vulnerable to Consensus Divergence in Transparent Sighash Hash-Type Handling. After a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade.

Details
- -------
Summary
After a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade.

Affected
- - zebrad (rust) < 4.3.1 — fixed in 4.3.1
- - zebra-script (rust) < 5.0.2 — fixed in 5.0.2

Severity
Critical (CVSS 9.3), as rated by the upstream advisory.

Recommended actions
- - Upgrade zebrad to 4.3.1 or later
- - Upgrade zebra-script to 5.0.2 or later

Source & attribution
This 0xCERT advisory summarises GHSA-8m29-fpq5-89jj / CVE-2026-41583 from the GitHub Advisory Database, credited upstream to conradoplg, mpguerra, sangsoo-osec: https://github.com/advisories/GHSA-8m29-fpq5-89jj. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-8m29-fpq5-89jj
- - CVE-2026-41583
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj
- - https://github.com/ZcashFoundation/zebra/commit/1f605eca5c55e3b65229fa01a97d9aa84fd37447
- - https://nvd.nist.gov/vuln/detail/CVE-2026-41583

Verify with the 0xCERT OpenPGP key: https://www.0xcert.com/pgp.asc
Fingerprint: 5F94 3ED1 1E50 CF31 2128  C493 CCC7 D9EC 9415 723D

-----BEGIN PGP SIGNATURE-----

wrsEARYKAG0FgmrIRqIJEDe9Tbcr+ZxrRRQAAAAAABwAIHNhbHRAbm90YXRp
b25zLm9wZW5wZ3Bqcy5vcmcGYTSwLtejizz6sdiOLaua4TR+CURFPu4WILgk
i9g3/hYhBGCkkFZbJcT5QWu27ze9Tbcr+ZxrAAAYYgD+O8K8Xs1Mt+KocIHd
8z/KnYK0bx3tohFTyeLhV/lSt2MA/jSN6Sag5TLuKOwE9VQCz5aw96+/LIm3
VP6nRl3OMeYB
=n8nr
-----END PGP SIGNATURE-----