CVE-2026-52880: GO-2026-5686 - klever-go: REST API slow-header connection exhaustion via Gin Engine.Run in github.com/klever-io/klever-go

CVE-2026-52880 · Severity: high · CVSS 7.5 · Published 2026-08-07

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.

Technologies: github.com/klever-io/klever-go (Go). Vendors: Go.

Quick answers

Is CVE-2026-52880 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-52880 being exploited in the wild.
How severe is CVE-2026-52880?
High severity, with a CVSS score of 7.5, published 7 August 2026.
Which products and versions are affected?
github.com/klever-io/klever-go (Go) SEMVER:introduced=1.7.14,fixed=1.7.18.
Is there a fix for CVE-2026-52880?
Yes. github.com/klever-io/klever-go (Go): upgrade to 1.7.18 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-52880?
Check whether you run github.com/klever-io/klever-go (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/klever-io/klever-go (Go): upgrade to 1.7.18 or later
    go get github.com/klever-io/klever-go@v1.7.18

Affected products

  • github.com/klever-io/klever-go (Go) SEMVER:introduced=1.7.14,fixed=1.7.18

Identifiers

  • CVE-2026-52880
  • GHSA-w4c6-7r69-w7j9
  • GO-2026-5686

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