high7.5
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 cons…
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| ZcashFoundation Zebra 6.4.0 | before 6.4.2 |
Versions were read from the advisory text. No structured product data has been published for this record yet.
Weakness classification
References
- NVD record
- CVE.org record
- 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-malformed-v6-transaction