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CVE-2026-52735— ZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser

Quick assessment

Affected
ZcashFoundation zebra
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zcash Foundation ZEBRA是Zcash Foundation基金会的一款区块链网络节点实现。 Zcash Foundation ZEBRA 4.5.0之前版本存在处理逻辑错误漏洞，该漏洞源于zebra-script/src/lib.rs中的p2sh_input_sigop_count函数对包含禁用操作码后跟签名操作码的赎回脚本P2SH签名操作计数不足，可能导致共识链分裂，影响网络完整性和可用性。

CVSS 9.3 · Critical EPSS 0.29% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
ZcashFoundation zebra < 4.5.0 affected
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I. Basic Information for CVE-2026-52735

Vulnerability Information
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Vulnerability Title
ZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, Zebra can accept a block that zcashd rejects because the P2SH signature-operation counter undercounts redeem scripts containing a disabled opcode followed by signature opcodes. In zebra-script/src/lib.rs, p2sh_input_sigop_count used the pure-Rust script::Code::sig_op_count path, whose try_fold parser stops at disabled opcodes such as OP_CODESEPARATOR and returns only the partial count accumulated before the error. The zcashd reference implementation continues static signature-operation counting through disabled opcodes, so an attacker can broadcast P2SH spends that Zebra counts below MAX_BLOCK_SIGOPS while zcashd counts above the 20,000-operation limit. If a Zebra miner includes those transactions, Zebra validators accept the block while zcashd validators reject it, creating a consensus chain split that affects network integrity and availability without requiring the attacker to produce a block. This issue is fixed in version 4.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
特定函数功能的不正确供给
Source: CVE Program / CVE List V5
Vulnerability Title
Zcash Foundation ZEBRA 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zcash Foundation ZEBRA是Zcash Foundation基金会的一款区块链网络节点实现。 Zcash Foundation ZEBRA 4.5.0之前版本存在处理逻辑错误漏洞，该漏洞源于zebra-script/src/lib.rs中的p2sh_input_sigop_count函数对包含禁用操作码后跟签名操作码的赎回脚本P2SH签名操作计数不足，可能导致共识链分裂，影响网络完整性和可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZcashFoundation zebra < 4.5.0 -

II. Public POCs for CVE-2026-52735

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7543 chars
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III. Intelligence Information for CVE-2026-52735

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Vendor Advisories for CVE-2026-52735 (1)

Vendor Pages for CVE-2026-52735 (1)

Same Patch Batch · ZcashFoundation · 2026-08-18 · 10 CVEs total

CVE-2026-52736 8.7 HIGH ZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cache
CVE-2026-52829 7.5 HIGH ZEBRA: IPv4-Mapped Mempool Misbehavior Update Aborts Zebra Address Book
CVE-2026-52738 6.9 MEDIUM ZEBRA: Finalized address balance credit-first overflow on consensus-valid blocks
CVE-2026-52731 6.5 MEDIUM ZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate
CVE-2026-52733 6.5 MEDIUM ZEBRA: Persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via
CVE-2026-52739 5.9 MEDIUM ZEBRA: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier
CVE-2026-52737 5.3 MEDIUM ZEBRA: Sync restart poisoning from single unauthenticated peer via above-lookahead block
CVE-2026-52732 5.3 MEDIUM ZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation
CVE-2026-52734 5.3 MEDIUM ZEBRA: Unbounded memory leak in mempool download pipeline via timeout path cancel_handles

IV. Related Vulnerabilities

Same product: zebra
Same vendor: ZcashFoundation
Same weakness: CWE-684

V. Comments for CVE-2026-52735

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