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CVE-2026-52739— ZEBRA: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
ZcashFoundationzebra< 4.5.0affected
ZcashFoundationzebra-state< 7.0.0affected
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I. Basic Information for CVE-2026-52739

Vulnerability Information
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Vulnerability Title
ZEBRA: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a malicious block producer can terminate zebrad by placing the same shielded transaction in a non-finalized parent block and its child. In zebra-state/src/service/non_finalized_state/chain.rs, Chain::push originally inserted the transaction hash into tx_loc_by_hash and asserted uniqueness before updating shielded data and running the duplicate Sprout, Sapling, or Orchard nullifier checks. The repeated transaction therefore reached the transactions must be unique within a single chain assertion before contextual validation could reject it cleanly. Zebra release builds use panic equals abort, so the reachable assertion terminates the entire process; exploitation requires either two consecutive attacker-mined blocks or an attacker-mined child immediately after an honest block includes the attacker's shielded transaction. 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:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
ZcashFoundationzebra < 4.5.0 -
ZcashFoundationzebra-state < 7.0.0 -

II. Public POCs for CVE-2026-52739

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III. Intelligence Information for CVE-2026-52739

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Vendor Advisories for CVE-2026-52739 (1)

Vendor Pages for CVE-2026-52739 (1)

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

CVE-2026-527359.3 CRITICALZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser
CVE-2026-527368.7 HIGHZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cache
CVE-2026-528297.5 HIGHZEBRA: IPv4-Mapped Mempool Misbehavior Update Aborts Zebra Address Book
CVE-2026-527386.9 MEDIUMZEBRA: Finalized address balance credit-first overflow on consensus-valid blocks
CVE-2026-527316.5 MEDIUMZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate
CVE-2026-527336.5 MEDIUMZEBRA: Persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via
CVE-2026-527375.3 MEDIUMZEBRA: Sync restart poisoning from single unauthenticated peer via above-lookahead block
CVE-2026-527325.3 MEDIUMZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation
CVE-2026-527345.3 MEDIUMZEBRA: Unbounded memory leak in mempool download pipeline via timeout path cancel_handles

IV. Related Vulnerabilities

Same product: zebra
Same vendor: ZcashFoundation
Same weakness: CWE-248

V. Comments for CVE-2026-52739

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