CVE-2026-25793

HIGH

Slackhq Nebula < 1.10.3 - Signature Verification Bypass

Title source: rule
STIX 2.1

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.

References (2)

Scores

CVSS v3 8.1
EPSS 0.0001
EPSS Percentile 0.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-347
Status published
Products (2)
slack/nebula 1.7.0 - 1.10.3
slackhq/nebula 1.7.0 - 1.10.3Go
Published Feb 06, 2026
Tracked Since Feb 18, 2026