What is GHSA-4c53-mmm8-cf87?

GHSA-4c53-mmm8-cf87 is a security advisory published by GitHub Security Advisories with High severity. Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy...

Which CVE IDs does GHSA-4c53-mmm8-cf87 cover?

GHSA-4c53-mmm8-cf87 covers the following CVE IDs: CVE-2026-104430. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-4c53-mmm8-cf87?

GHSA-4c53-mmm8-cf87 has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-4c53-mmm8-cf87HighCVSS 7.5

Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy...

Vendor

GitHub Security Advisories

Published

October 2, 2026

Last Modified

October 2, 2026

🔗 CVE IDs covered (1)

CVE-2026-104430 →

📋 Description

Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy mode rather than zcashd's accurate P2SH mode, overcounting CHECKMULTISIG preceded by OP_1 through OP_16 as 20 sigops and causing a consensus divergence. Remote attackers can broadcast P2SH spends using low-threshold multisig redeem scripts so that a block zcashd accepts exceeds Zebra's inflated MAX_BLOCK_SIGOPS count, causing Zebra nodes to reject it and stall off the chain.

🔗 References (4)

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-2prc-cj5x-4443
https://nvd.nist.gov/vuln/detail/CVE-2026-104430
https://www.vulncheck.com/advisories/zebra-4.5.0-consensus-split-via-p2sh-sigop-overcount
https://github.com/advisories/GHSA-4c53-mmm8-cf87