CVE-2026-44498

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

cpe:2.3:a:zfnd:zebrad:*:*:*:*:*:rust:*:*

History

08 May 2026, 18:40

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
First Time		Zfnd zebrad Zfnd
References	~~() https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0 -~~	() https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0 - Release Notes
References	~~() https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc -~~	() https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc - Vendor Advisory
CPE		cpe:2.3:a:zfnd:zebrad::::::rust::*

08 May 2026, 15:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-08 15:17

Updated : 2026-05-08 18:40

NVD link : CVE-2026-44498

Mitre link : CVE-2026-44498

CVE.ORG link : CVE-2026-44498

JSON object : View

Products Affected

zfnd

zebrad

CWE

CWE-682

Incorrect Calculation

{"id": "CVE-2026-44498", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-05-08T15:17:01.637", "references": [{"url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-682"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-05-08T18:40:55.383", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zfnd:zebrad:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "23232F98-CB60-4B90-B46A-430E3E1CE10B", "versionEndExcluding": "4.4.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}