CVE-2026-25793

Published February 6th, 2026

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CVSS v3

8.1

HIGH

CVSS v2

N/A

Affected

PROJECT

Description

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.

slackhq/nebula

A scalable overlay networking tool with a focus on performance, simplicity and security

GitHub

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