CVE-2026-109363CWE-617

CVE-2026-109363

High · published October 12, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
36.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00432 · 36.4th percentile
Weakness
CWE-617 · Reachable Assertion
Published
2026-10-12T21:17Z
References (3)
https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e37851df49a · [email protected]https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9 · [email protected]https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service-via-malformed-v6-transaction · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:05Z
    Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction
    cvelistv5
  • 12 OCT 16:05Z
    Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction
    cvelistv5