Description
Zebra before 6.0.0 contains a denial of service vulnerability that allows unauthenticated peers to stall Tokio workers by submitting mempool transactions requiring expensive synchronous script verification. Attackers can send non-standard high-sigop P2SH transactions that reach CachedFfiTransaction::is_valid() before standardness checks, saturating the verifier buffer and rendering the node unresponsive.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ZcashFoundation | zebra | < 6.0.0 | 6.0.0 |
References
- GitHub Security Advisory (GHSA-84j3-rw4c-gqmj) vendor-advisory
- VulnCheck Advisory: Zebra before 6.0.0 Denial of Service via Synchronous Script FFI Verification third-party-advisory