Slack Nebula vulnerabilities

3 vulnerabilities

Known vulnerabilities in Slack Nebula, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

4.9CVE-2025-62820chainguardcaddy+20
EPSS score
0.22%
Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.8.8CVE-2020-11498slacknebula
EPSS score
3.40%
Slack Nebula through 1.1.0 contains a relative path vulnerability that allows a low-privileged attacker to execute code in the context of the root user via tun_darwin.go or tun_windows.go. A user can also use Nebula to execute arbitrary code in the user's own context, e.g., for user-level persistence or to bypass security controls. NOTE: the vendor states that this "requires a high degree of access and other preconditions that are tough to achieve."8.1CVE-2026-25793chainguardcaddy+14
EPSS score
0.18%
Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.