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CVE-2026-52731— ZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate

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之前版本存在异常处理不当漏洞，该漏洞源于对getblocktemplate LongPollId的输入处理不当，切片边界可能落在多字节UTF-8字符内，触发Rust panic，导致经过身份验证的攻击者终止zebrad节点进程，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.38% · P31

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
ZcashFoundation zebra < 4.5.0 affected
ZcashFoundation zebra-rpc < 8.0.0 affected
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I. Basic Information for CVE-2026-52731

Vulnerability Information
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Vulnerability Title
ZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an attacker authenticated to an enabled Zebra RPC endpoint can terminate zebrad by supplying a getblocktemplate LongPollId containing multi-byte UTF-8 characters. In zebra-rpc/src/methods/types/long_poll.rs, LongPollId::from_str originally checked the input byte length and then sliced fixed byte ranges to parse encoded fields. A slice boundary can land inside a multi-byte character and trigger Rust's byte index is not a char boundary panic. Zebra release builds use panic equals abort, so one malformed authenticated RPC request terminates the entire node process and can be repeated after restart. This issue is fixed in version 4.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Vulnerability Title
Zcash Foundation ZEBRA 异常处理不当漏洞
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之前版本存在异常处理不当漏洞，该漏洞源于对getblocktemplate LongPollId的输入处理不当，切片边界可能落在多字节UTF-8字符内，触发Rust panic，导致经过身份验证的攻击者终止zebrad节点进程，造成拒绝服务。
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-rpc < 8.0.0 -

II. Public POCs for CVE-2026-52731

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III. Intelligence Information for CVE-2026-52731

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Vendor Advisories for CVE-2026-52731 (1)

Vendor Pages for CVE-2026-52731 (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-2026-52733 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-248

V. Comments for CVE-2026-52731

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