---
cve: "CVE-2026-44498"
severity: "CRITICAL"
cvss: 9.2
epss: "0.4%"
vendor: "ZcashFoundation"
kev: false
exploited: false
published: "2026-05-08 15:17:01"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-10T01:19:29+02:00"
---

# CVE-2026-44498

> 9.2 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 589d64b9b7ea6ab4c32ecab41ba6b74f26907940 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-44498/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_