CVE-2026-25793

HIGH

8.1

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.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/6/2026

Last Modified2/18/2026

Sourcenvd

Honeypot Sightings0

Affected Products

slack:nebula

Weaknesses (CWE)

CWE-347

References

https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21(security-advisories@github.com)

https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962(security-advisories@github.com)

IOC Correlations

No correlations recorded

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