CVE-2026-44499

The record

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 packages

Related vulnerabilities

• GHSA-h9hm-m2xj-4rq9 Zebra has Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning Same vulnerability
• GHSA-pvmv-cwg8-v6c8 Zebra v4.4.0 still accepts V5 SIGHASH_SINGLE without a corresponding output Also affects zebrad
• CVE-2026-44497 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
• CVE-2026-44498 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
• CVE-2026-44500 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
• CVE-2026-41583 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
• CVE-2026-41584 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
• CVE-2026-41585 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad