CVE-2026-104424
Published:October 02, 2026
Updated:October 11, 2026
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.
Affected Packages
https://github.com/ZcashFoundation/zebra.git (GITHUB):
Affected version(s) >=v6.0.0-rc.0 <v6.1.0Fix Suggestion:
Update to version v6.1.0zebra-rpc (RUST):
Affected version(s) >=11.0.0 <12.0.0Fix Suggestion:
Update to version 12.0.0zebrad (RUST):
Affected version(s) >=6.0.0-rc.0 <6.1.0Fix Suggestion:
Update to version 6.1.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Incorrect Calculation of Buffer Size
EPSS
Base Score:
0.27