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Advisory record · GHSA-4fwh-wrm6-97xm

Klever-Go: Unauthenticated WebSocket /subscribe: no read-size limit, no connection cap, permissive origin -> remote node memory/goroutine exhaustion (DoS)

CVSS 7.5 HighEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 19:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/klever-io/klever-goGo<1.7.201.7.20
Identifiers
GHSA-4fwh-wrm6-97xm · CVE-2026-86065 · GO-2026-6581
Weakness (CWE)
CWE-770
Tags
Published
23 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

GHSA-4fwh-wrm6-97xm affects the Go module github.com/klever-io/klever-go before 1.7.20, fixed in 1.7.20. The unauthenticated WebSocket endpoint /subscribe has no read-size limit, no connection cap, and accepts any origin, so a remote client can exhaust memory and goroutines and crash the node process. Upgrade to 1.7.20 or later. The source gives no workaround.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.