CVE-2026-41583 ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling

What is CVE-2026-41583?

CVE-2026-41583 is a critical vulnerability in ZcashFoundation zebra, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, 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. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between Zebra and zcashd nodes. In a similar vein, for V4 transactions, Zebra mistakenly used the "canonical" hash type when computing the sighash while zcashd (correctly per the spec) uses the raw value, which could also crate a consensus split. This issue has been patched in zebrad version 4.3.1 and zebra-script version 5.0.2.

Weakness: CWE-573

Which versions are affected by CVE-2026-41583?

4 open source packages ship an affected version, including zebra-script and zebrad. It affects 2 products.

Products include Zfnd Zebra-Script, Zfnd Zebrad.

How do I fix CVE-2026-41583?

Upgrade zebra-script to 5.0.2 or later.

Is CVE-2026-41583 being exploited?

There is no known exploitation of CVE-2026-41583 in the wild and no public exploit code.

Other vulnerabilities in ZcashFoundation zebra

• CVE-2026-44497 ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8m29-fpq5-89jj.