CVE-2026-44498

EUVD-2026-28783
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
zfndzebrad
𝑥
< 4.4.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc