Description
Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ZcashFoundation | zebra | < 4.5.0 | 4.5.0 |
| ZcashFoundation | zebra-chain | < 8.0.0 | 8.0.0 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | zebra-chain | < 8.0.0 | 8.0.0 | GHSA-443g-gwgp-49x4 |
| crates.io | zebrad | < 4.5.0 | 4.5.0 | GHSA-443g-gwgp-49x4 |
References
- GitHub Security Advisory (GHSA-443g-gwgp-49x4) vendor-advisory
- VulnCheck Advisory: Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length third-party-advisory