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CVE-2026-52733— ZEBRA: Persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via pop_tip

Quick assessment

Affected
ZcashFoundation zebra
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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/non_finalized_state/chain.rs中Chain::pop_tip移除回滚tip块时未同时移除属于该块的子树条目，导致链分叉后遗留过时的Sapling和Orchard note-commitment子树根，可能造成钱包同步失败或错误

CVSS 6.5 · Medium EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1565.001 · Stored Data Manipulation

Affected Version Matrix 2

VendorProduct Version RangeStatus
ZcashFoundation zebra < 4.5.0 affected
ZcashFoundation zebra-state < 7.0.0 affected
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I. Basic Information for CVE-2026-52733

Vulnerability Information
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Vulnerability Title
ZEBRA: Persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via pop_tip
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a natural or attacker-influenced chain fork can leave stale Sapling and Orchard note-commitment subtree roots in Zebra state. In zebra-state/src/service/non_finalized_state/chain.rs, Chain::pop_tip removed a reverted tip block but did not remove subtree entries whose end_height belonged to that block, unlike the cleanup performed by pop_root. When the winning fork later finalized, the abandoned branch's stale subtree data could be written to RocksDB and survive node restarts. The corrupted history can cause z_getsubtreesbyindex consumers such as lightwalletd and light wallets to receive incorrect subtree roots, producing wallet synchronization failures or incorrect wallet state and requiring a full state rebuild for recovery. This issue is fixed in version 4.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
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/non_finalized_state/chain.rs中Chain::pop_tip移除回滚tip块时未同时移除属于该块的子树条目，导致链分叉后遗留过时的Sapling和Orchard note-commitment子树根，可能造成钱包同步失败或错误
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 -
ZcashFoundation zebra-state < 7.0.0 -

II. Public POCs for CVE-2026-52733

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III. Intelligence Information for CVE-2026-52733

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Vendor Advisories for CVE-2026-52733 (1)

Vendor Pages for CVE-2026-52733 (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-2026-52736 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-2026-52739 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-2026-52733

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