What’s Vulnerable › Vulnerabilities
CVE-2026-44499: ZEBRA: Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning
- Severity: high (CVSS 8.7 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-08 · updated 2026-10-26
- Weakness: CWE-770
Description
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.
Affected products
- ZcashFoundation zebra: before 4.4.0
References
Get alerted when CVE-2026-44499 or the next vulnerability affects your stack