CVE-2026-44499
ZEBRA: Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, a composite denial-of-service vulnerability in Zebra's block discovery pipeline allows an unauthenticated remote attacker to permanently halt all new block discovery on a targeted node. The attack exploits three independent weaknesses in the gossip, syncer, and download subsystems — all exercisable from a single TCP connection — to create a monotonically growing block deficit that never self-heals. This issue has been patched in version 4.4.0.
| CWE | CWE-770 |
| Vendor | zcashfoundation |
| Product | zebra |
| Published | May 8, 2026 |
| Last Updated | May 8, 2026 |
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Affected Versions
ZcashFoundation / zebra
< 4.4.0