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CVE-2026-52880— Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run

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版本存在资源管理错误漏洞，该漏洞源于REST API使用Gin Engine.Run启动时未配置ReadHeaderTimeout、ReadTimeout或MaxHeaderBytes，导致慢连接被无限期保持，耗尽服务器文件描述符，可能造成拒绝服务攻击。

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-2026-52880

Vulnerability Information
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Vulnerability Title
Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Versions from 1.7.14 through 1.7.17 are vulnerable to a remotely triggerable denial of service. Both REST APIs are started with the Gin Engine.Run convenience method, which serves requests through Go's default HTTP server with no ReadHeaderTimeout, ReadTimeout, or MaxHeaderBytes configured. As a result, incoming connections that never complete their request headers are held open indefinitely. When a REST listener is reachable beyond localhost through the documented all-interface bind or a Docker port-publish deployment, a single unauthenticated client can open many slow-header connections and hold them open until server file descriptors are exhausted, preventing the API from accepting new connections. This renders the REST API unavailable to legitimate clients. This issue is 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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Klever 资源管理错误漏洞
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版本存在资源管理错误漏洞，该漏洞源于REST API使用Gin Engine.Run启动时未配置ReadHeaderTimeout、ReadTimeout或MaxHeaderBytes，导致慢连接被无限期保持，耗尽服务器文件描述符，可能造成拒绝服务攻击。
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-2026-52880

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8377 chars
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III. Intelligence Information for CVE-2026-52880

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Vendor Advisories for CVE-2026-52880 (2)

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

CVE-2026-52878 7.5 HIGH Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chai
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-2026-58262 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-400

V. Comments for CVE-2026-52880

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