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

CVSS 7.5 · High EPSS 0.29% · P22

Affected Version Matrix 1

VendorProductVersion RangeStatus
klever-ioklever-go>= 1.7.14, < 1.7.18affected
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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

Affected Products

VendorProductAffected VersionsCPESubscribe
klever-ioklever-go >= 1.7.14, < 1.7.18 -

II. Public POCs for CVE-2026-52880

#POC DescriptionSource LinkShenlong 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-2026-528787.5 HIGHKlever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chai
CVE-2026-528797.5 HIGHKlever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS
CVE-2026-472497.5 HIGHKlever-Go KVM: Hash-array amplification in P2P resolver request handling
CVE-2026-582627.1 HIGHKlever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum
CVE-2026-493435.9 MEDIUMKlever-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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