Unprotected Alternate Channel Affecting github.com/slackhq/nebula package, versions >=1.9.4 <1.9.7
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMSLACKHQNEBULA-13671312
- published23 Oct 2025
- disclosed23 Oct 2025
- creditGary Guo
Introduced: 23 Oct 2025
NewCVE-2025-62820 (opens in a new tab)How to fix?
Upgrade github.com/slackhq/nebula to version 1.9.7 or higher.
Overview
github.com/slackhq/nebula is a scalable overlay networking tool with a focus on performance, simplicity and security.
Affected versions of this package are vulnerable to Unprotected Alternate Channel via improper handling of CIDR configuration in certificates. An attacker with control over a network node can bypass restrictions by sending packets with arbitrary source IP addresses within the network. Successful exploitation of this vulnerability allows for IP spoofing, sending arbitrary UDP packets to services, or disrupting traffic by sending TCP RST packets.