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Advisory record · GHSA-x6fh-7qmf-69xh

Slack Nebula may accept arbitrary source IP addresses

CVSS 4.9 MediumEPSS 0.0022 · 12th percentile

Published by the GitHub Advisory Database at 23 Oct 2025, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/slackhq/nebulaGo>=1.9.4, <1.9.71.9.7
Identifiers
GHSA-x6fh-7qmf-69xh · CVE-2025-62820 · GO-2025-4068
Weakness (CWE)
CWE-420
Tags
Published
23 Oct 2025
Updated
10 Sept 2026

Machine-written summary

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

Slack Nebula versions 1.9.4 up to but not including 1.9.7 are affected. The source gives few details, but it says Nebula mishandles CIDR in some configurations and can accept arbitrary source IP addresses within the Nebula network. Upgrade to Nebula 1.9.7 or later. The source does not list a 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
4.9 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L CNA (mitre)
  • CISA KEV Not listed.
  • EPSS 0.0022, the 12th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

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