CVE-2026-44499
HighSummary
ZEBRA, a Zcash node written in Rust, prior to version 4.4.0 had a composite denial-of-service vulnerability in its block discovery process. An unauthenticated remote attacker could permanently halt new block discovery on a targeted node by exploiting three independent weaknesses.
Risk Assessment
This vulnerability could lead to a complete blockage of block discovery functionality, affecting the availability and integrity of the Zcash network. Organizations using ZEBRA may experience significant operational disruptions.
Recommendation
It is recommended to upgrade to version 4.4.0 or later to mitigate this vulnerability. Regular monitoring and updating of software is crucial for maintaining security.
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Original NVD description (English source)
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.