What’s Vulnerable › Vulnerabilities

CVE-2026-44498: ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-682

Description

ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0.

Affected products

• ZcashFoundation zebra: before 4.4.0 — fixed in 4.4.0

How to fix

Upgrade to a fixed version: ZcashFoundation zebra 4.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0
• https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc

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