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CVE-2026-52736— ZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cache

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之前版本存在资源管理错误漏洞，该漏洞源于在zebra-state/src/service.rs的queue_and_commit_to_non_finalized_state中，区块体哈希在上下文验证完成前被记录，且写入任务拒绝时未移除，导致后续合法区块体被KnownBlock::WriteChannel重复处理抑制，可能导致远程未认证的P

CVSS 8.7 · High EPSS 0.44% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
ZcashFoundation zebra < 4.5.0 affected
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I. Basic Information for CVE-2026-52736

Vulnerability Information
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Vulnerability Title
ZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cache
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a remote unauthenticated P2P peer can stall a Zebra node by racing an invalid block body against the valid canonical body for the same block header hash. ZIP-244 permits the attacker to mutate coinbase scriptSig authentication data while retaining the transaction identifiers, merkle root, and block header hash, so the poisoned body fails later commitment validation but shares the canonical hash. In zebra-state/src/service.rs, queue_and_commit_to_non_finalized_state recorded the hash in non_finalized_block_write_sent_hashes before contextual validation completed and did not remove it when the write task rejected the body. When the honest body later arrived, the cached hash caused KnownBlock::WriteChannel duplicate handling to suppress it, leaving the node stuck one height behind until restart or reorganization. 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:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
Zcash Foundation ZEBRA 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于在zebra-state/src/service.rs的queue_and_commit_to_non_finalized_state中，区块体哈希在上下文验证完成前被记录，且写入任务拒绝时未移除，导致后续合法区块体被KnownBlock::WriteChannel重复处理抑制，可能导致远程未认证的P
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-2026-52736

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8134 chars
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III. Intelligence Information for CVE-2026-52736

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Vendor Advisories for CVE-2026-52736 (1)

Vendor Pages for CVE-2026-52736 (1)

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

CVE-2026-52735 9.3 CRITICAL ZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser
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-459

V. Comments for CVE-2026-52736

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