HIGH 8.7 NVD
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 during UnminedTx const
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.
References
- https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e37851df49a
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9
- https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service-via-malfor
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-12 via NVD.
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