CVE-2026-104432 Zebra before 6.3.0 False Readiness via Discarded One-Hash FindBlocks Response

Zebra before 6.3.0 contains an improper exceptional condition check in ChainSync::obtaintips that discards valid one-hash FindBlocks responses, falsely reporting close-to-tip status. Peers returning only the next block hash cause a zero-length sync sample, making the /ready endpoint return 200 OK...

EUVD-2026-91443

Zebra before 6.3.0 contains an improper exceptional condition check in ChainSync::obtaintips that discards valid one-hash FindBlocks responses, falsely reporting close-to-tip status. Peers returning only the next block hash cause a zero-length sync sample, making the /ready endpoint return 200 OK...

CVE-2026-104419 Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes

Zebra zebrad 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a...

CVE-2026-104419

The Zebra (zebrad) software, versions 4.5.0 before 6.3.0 , is vulnerable to a logic flaw in how it handles FindBlocks responses. The software fails to track which peer provided specific block hashes, leading it to assign 100 misbehavior points (the ban threshold) to any peer that serves a block m...

EUVD-2026-91430

Zebra zebrad 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a...

CVE-2026-104419 Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes

Zebra zebrad 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a...

CVE-2026-104419 Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes

Zebra zebrad 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a...

PT-2026-104230

Name of the Vulnerable Software and Affected Versions Zebra zebrad versions 4.5.0 through 6.2.0 Description The software fails to track which peer supplied block hashes in FindBlocks responses. It assigns 100 misbehavior points, which is the ban threshold, to any peer that serves a requested bloc...

CVE-2026-52737: Insufficient Verification of Data Authenticity

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a malicious unauthenticated P2P peer can answer Zebra's outbound getblocks or FindBlocks request with a small two-hash inventory and then serve a syntactically valid block whose coinbase height is far above the local chain tip. In...

PT-2026-55473

Name of the Vulnerable Software and Affected Versions ZEBRA versions prior to 4.4.2 Description A malicious unauthenticated P2P peer can degrade the synchronization of a Zcash node by responding to outbound getblocks or FindBlocks requests with a small two-hash inventory and a syntactically valid...