by Kastro
Paper/Archive/CVE-2026-44498

CVE-2026-44498

ZcashFoundation zebra — ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops

EPSS 0.3%CVSS 9.2
critical.is priorityof 100
32
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 20.8.208 × 204.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
zebra< 4.4.0–CNA

Scores by source

GitHub_M (CNA)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
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23ccrefgithub.com/ZcashFoundation/zebra/releases/tag/v4.4.0