Cyber Resilience

CVE-2026-44498

Critical

Published: 08 May 2026

Published
08 May 2026
Modified
08 May 2026
KEV Added
—
Patch
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CVSS Score v4 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0028 20.1th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-44498 is a critical-severity Incorrect Calculation (CWE-682) vulnerability in Zfnd Zebrad. Its CVSS base score is 9.2 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 20.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

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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.

CWE(s)
CWE-682

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Validation bypass in public blockchain node software directly enables crafted block submission to cause network split/partitioning.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-40880Same product: Zfnd Zebrad
CVE-2026-41583Same product: Zfnd Zebrad
CVE-2026-41584Same product: Zfnd Zebrad
CVE-2026-44497Same product: Zfnd Zebrad
CVE-2026-40881Same product: Zfnd Zebrad
CVE-2026-34377Same vendor: Zfnd
CVE-2026-34202Same vendor: Zfnd
CVE-2026-1229Shared CWE-682
CVE-2025-26622Shared CWE-682
CVE-2026-24783Shared CWE-682

Affected Assets

zfnd
zebrad
≤ 4.4.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References