CVE WatchOct 15, 2026

CVE-2026-109363

ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch ID, but the size computation du

CVSS

7.5

High

EPSS

0.4%

p36

KEV

—

Exploit Today

0-100

Published: Oct 12, 2026 · Last modified: Oct 15, 2026 · CWE-617

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-132026-10-23

Technical description

ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch ID, but the size computation during UnminedTx construction treats re-serialization of the Orchard bundle as infallible, so the resulting error trips an expect that aborts zebrad. Unauthenticated peers can send a single pre-handshake tx message to crash the node, and can repeat this after each restart.

Official references

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