CVE-2026-104430CWE-628

CVE-2026-104430

High · published October 2, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
34.1
In the wild
Unconfirmed
What it is

Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy mode rather than zcashd's accurate P2SH mode, overcounting CHECKMULTISIG preceded by OP_1 through OP_16 as 20 sigops and causing a consensus divergence. Remote attackers can broadcast P2SH spends using low-threshold multisig redeem scripts so that a block zcashd accepts exceeds Zebra's inflated MAX_BLOCK_SIGOPS count, causing Zebra nodes to reject it and stall off the chain.

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
0.00409 · 34.1th percentile
Weakness
CWE-628 · Function Call with Incorrectly Specified Arguments
Published
2026-10-02T16:17Z
References (2)
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-2prc-cj5x-4443 · [email protected]https://www.vulncheck.com/advisories/zebra-4.5.0-consensus-split-via-p2sh-sigop-overcount · [email protected]
EPSS history
Timeline
  • 04 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 02 OCT 11:38Z
    Zebra 4.5.0 Consensus Split via P2SH Sigop Overcount
    cvelistv5