CVE-2026-104430

Summary

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.

Affected Software

VendorProductVersion RangeStatus
ZcashFoundationzebra4.5.0 < 4.5.1affected
ZcashFoundationzebra4.5.1unaffected
ZcashFoundationzebra7.0.0 < 7.0.1affected
ZcashFoundationzebra7.0.1unaffected

Weaknesses

  • CWE-628: Function Call with Incorrectly Specified Arguments

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References