CVE-2026-109363 (GCVE-0-2026-109363)
Vulnerability from cvelistv5 – Published: 2026-10-12 16:05 – Updated: 2026-10-13 16:22
VLAI
EPSS
VEX
Title
Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 16:21 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/ZcashFoundation/zebra/security… | vendor-advisory |
| https://github.com/ZcashFoundation/zebra/commit/0… | patch |
| https://www.vulncheck.com/advisories/zebra-6.4.0-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
6.4.0 , < 6.4.2
(semver)
Unaffected: 6.4.2 (semver) cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:* |
Date Public
2026-09-25 00:00
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