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0xCERT Security Advisory 0xCERT-2026-0191
============================================================

Advisory-ID:  0xCERT-2026-0191
Severity:     Critical
Published:    2026-05-07T20:54:33.000Z
Updated:      2026-10-08T22:47:29.196Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0191

Title: Zebra's Block Validator Undercounts Coinbase and P2SH Sigops

Summary
- -------
Zebra's Block Validator Undercounts Coinbase and P2SH Sigops. Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAXBLOCKSIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops.

Details
- -------
Summary
Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAXBLOCKSIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops.

Affected
- - zebrad (rust) < 4.4.0 — fixed in 4.4.0

Severity
Critical (CVSS 9.2), as rated by the upstream advisory.

Recommended actions
- - Upgrade zebrad to 4.4.0 or later

Source & attribution
This 0xCERT advisory summarises GHSA-jv4h-j224-23cc / CVE-2026-44498 from the GitHub Advisory Database, credited upstream to sangsoo-osec, upbqdn, mpguerra, defuse: https://github.com/advisories/GHSA-jv4h-j224-23cc. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-jv4h-j224-23cc
- - CVE-2026-44498
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc
- - https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0
- - https://nvd.nist.gov/vuln/detail/CVE-2026-44498

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