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CVE-2026-52878— Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain

Quick assessment

Affected
klever-io klever-go
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.

Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.14版本至1.7.17版本存在异常处理不当漏洞，该漏洞源于protobuf Transaction的RawData子消息缺失导致空指针解引用，可能导致攻击者通过发送特制消息使节点进程崩溃，停止区块生产并导致链停止。

CVSS 7.5 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go >= 1.7.14, < 1.7.18 affected
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I. Basic Information for CVE-2026-52878

Vulnerability Information
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Vulnerability Title
Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Versions 1.7.14 through 1.7.17 are vulnerable to a nil-pointer panic triggered by a protobuf Transaction whose embedded RawData sub-message is omitted. This omission causes RawData to decode to nil. Every transaction gossiped on the Klever-Go P2P network is decoded and validated synchronously inside the libp2p pubsub topic-validator callback, where txVersionChecker.CheckTxVersion dereferences tx.RawData.Version with no nil check. Because the libp2p pubsub callback, the underlying go-libp2p-pubsub validation worker, and Klever's own network/p2p layer install no recover(), the panic propagates and crashes the entire node process. The attacker payload is a 3-byte protobuf message; no validator key, stake, funds, or on-chain account is required, and delivery aimed at enough of the BLS validator set can halt block production, resulting in a chain halt. This issue has been fixed in version 1.7.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Klever 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.14版本至1.7.17版本存在异常处理不当漏洞，该漏洞源于protobuf Transaction的RawData子消息缺失导致空指针解引用，可能导致攻击者通过发送特制消息使节点进程崩溃，停止区块生产并导致链停止。
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
klever-io klever-go >= 1.7.14, < 1.7.18 -

II. Public POCs for CVE-2026-52878

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 7374 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-52878

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Vendor Advisories for CVE-2026-52878 (2)

Same Patch Batch · klever-io · 2026-08-07 · 6 CVEs total

CVE-2026-52879 7.5 HIGH Klever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS
CVE-2026-47249 7.5 HIGH Klever-Go KVM: Hash-array amplification in P2P resolver request handling
CVE-2026-52880 7.5 HIGH Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run
CVE-2026-58262 7.1 HIGH Klever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum
CVE-2026-49343 5.9 MEDIUM Klever-Go KVM: Throttler slot leak in trie account-data sync causes epoch bootstrap / stat

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-476

V. Comments for CVE-2026-52878

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