CVE-2026-44498

Name: CVE-2026-44498
Creator: NVD / NIST
Published: 2026-05-08T15:17:01.637+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.2/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2026-44498 is a critical-severity vulnerability rated 9.2/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS 4.0

9.2/10

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 Probability

0.28%

20.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-682

Affected Software

Vendor	Product	Versions
Zfnd	Zebrad	< 4.4.0

References

https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0Release Notes
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23ccVendor Advisory

Timeline

Published: May 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-44498?

How severe is CVE-2026-44498?

CVE-2026-44498 has a CVSS score of 9.2/10 (CRITICAL severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2026-44498?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-44498?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST