Zebra before 6.1.0 contains an incorrect calculation vulnerability in its ZIP-317 block template selector that omits header and transaction-count size from the block budget. Attackers can place valid selectable transactions in a victim miner's mempool to shape templates into oversized blocks, causing rejection and wasted proof-of-work.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
ZcashFoundation zebra unaffected
Version Status Constraints
0 affected < 6.1.0
6.1.0 unaffected —

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Project Subscriptions

Vendors Products
Zfnd Subscribe
Zebra Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-95m2-vx53-v2jw cve-icon cve-icon
https://www.vulncheck.com/advisories/zebra-before-6.1.0-incorrect-block-size-calculation-in-getblocktemplate cve-icon cve-icon
History

Fri, 02 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
Description Zebra before 6.1.0 contains an incorrect calculation vulnerability in its ZIP-317 block template selector that omits header and transaction-count size from the block budget. Attackers can place valid selectable transactions in a victim miner's mempool to shape templates into oversized blocks, causing rejection and wasted proof-of-work.
Title Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate
First Time appeared Zfnd
Zfnd zebra
Weaknesses CWE-131
CPEs cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*
Vendors & Products Zfnd
Zfnd zebra
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-02T11:38:05.827Z

Reserved: 2026-10-02T00:46:23.830Z

Link: CVE-2026-104424

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-02T12:17:12.580

Modified: 2026-10-02T12:17:12.580

Link: CVE-2026-104424

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T13:15:16Z

Weaknesses