CVE-2026-104424
6.3
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
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ZcashFoundation | zebra | 0 < 6.1.0 | affected |
| ZcashFoundation | zebra | 6.1.0 | unaffected |
Weaknesses
- CWE-131: Incorrect Calculation of Buffer Size
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-95m2-vx53-v2jw
- https://www.vulncheck.com/advisories/zebra-before-6.1.0-incorrect-block-size-calculation-in-getblocktemplate
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