zebrad has consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser
zebrad has consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser. You are affected if: 1. You run any version of zebrad up to and including v4.4.1. 2. Your node validates blocks on mainnet, testnet, or any network where both Zebra and zcashd nodes participate.
Vuln-watch · relayed from the GitHub Advisory Database; see Source & attribution below
Summary
You are affected if: 1. You run any version of zebrad up to and including v4.4.1. 2. Your node validates blocks on mainnet, testnet, or any network where both Zebra and zcashd nodes participate.
Affected
- zebra-script (rust) <= 6.0.1 — fixed in 7.0.0
- zebrad (rust) <= 4.4.1 — fixed in 4.5.0
Severity
Critical (CVSS 9.3), as rated by the upstream advisory.
Recommended actions
- Upgrade zebra-script to 7.0.0 or later
- Upgrade zebrad to 4.5.0 or later
Source & attribution
This 0xCERT advisory summarises GHSA-gf9r-m956-97qx / CVE-2026-52735 from the GitHub Advisory Database, credited upstream to samsulselfut, mpguerra, arya2: https://github.com/advisories/GHSA-gf9r-m956-97qx. Details may change; refer to the original source for the authoritative record.
References
- https://github.com/advisories/GHSA-gf9r-m956-97qx
- CVE-2026-52735
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-gf9r-m956-97qx
- https://github.com/AlfredoG87/zcash_script/blob/v0.4.4/src/script/iter.rs#L104-L115
- https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-consensus/src/block.rs#L140
- https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-script/src/lib.rs#L383-L400
OpenPGP-signed. The signed text of this advisory verifies against the 0xCERT key CCC7 D9EC 9415 723D.
Published 2026-07-02 · last updated 2026-10-08
curl -s https://www.0xcert.com/pgp.asc | gpg --import && curl -s https://www.0xcert.com/advisory/0xCERT-2026-0205/signed.txt | gpg --verify