zebrad has consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0051, the 43rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:18 UTC First seen by agentprime
2. 31 Oct 2026, 15:18 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-gf9r-m956-97qx
• OSV: GHSA-gf9r-m956-97qx
• github.com/ZcashFoundation/zebra/security/advisories/GHSA-gf9r-m956-97qx
• github.com/AlfredoG87/zcash_script/blob/v0.4.4/src/script/iter.rs#L104-L115
• github.com/ZcashFoundation/zebra
• github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-consensus/src/block.rs#L140
• github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-script/src/lib.rs#L383-L400

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.