CVE-2026-104437CWE-347

CVE-2026-104437

High · published October 2, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
9.9
In the wild
Unconfirmed
What it is

Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, computing a ZIP-244 digest for SIGHASH_SINGLE inputs lacking corresponding outputs instead of failing. Attackers can craft V5 transactions with fewer outputs than inputs that Zebra accepts and templates via getblocktemplate, producing blocks zcashd rejects.

The record
Technical detail
CVSS v3.1
7.4 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
8.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00205 · 9.9th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-10-02T16:17Z
References (3)
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-cwfq-rfcr-8hmp · [email protected]https://www.vulncheck.com/advisories/zebra-before-4.4.0-consensus-split-via-sighash-single-missing-output-handling · [email protected]https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-cwfq-rfcr-8hmp · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 04 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 02 OCT 11:38Z
    Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling
    cvelistv5