# CVE-2026-44498

## Summary

- **CVE ID:** CVE-2026-44498
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N)
- **CWE:** CWE-682
- **Published:** May 8, 2026
- **Last Modified:** May 14, 2026

## 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 (< 4.4.0)

## References

- [CNA](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc)
- [CNA](https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._