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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.

PUBLISHED Reserved 2026-05-06 | Published 2026-05-08 | Updated 2026-05-08 | Assigner GitHub_M




CRITICAL: 9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

Problem types

CWE-682: Incorrect Calculation

Product status

< 4.4.0
affected

References

github.com/.../zebra/security/advisories/GHSA-jv4h-j224-23cc

github.com/ZcashFoundation/zebra/releases/tag/v4.4.0

cve.org (CVE-2026-44498)

nvd.nist.gov (CVE-2026-44498)

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