CVE-2026-104424
Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 2, 2026
- Updated
- Oct 6, 2026
- Reserved
- Oct 2, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | 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 | VulnCheck |
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-131 Incorrect Calculation of Buffer Size
Affected Products
| Product | Versions |
|---|---|
zebraZcashFoundation |
|
References
- GitHub Security Advisory (GHSA-95m2-vx53-v2jw)vendor-advisory
- VulnCheck Advisory: Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplatethird-party-advisory
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