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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-69x3-g4r3-p962 Blocklist Bypass possible via ECDSA Signature Malleability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 09 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 09 Feb 2026 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Slack
Slack nebula
Vendors & Products Slack
Slack nebula

Fri, 06 Feb 2026 23:00:00 +0000

Type Values Removed Values Added
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.
Title Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability
Weaknesses CWE-347
References
Metrics cvssV4_0

{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-09T15:25:50.582Z

Reserved: 2026-02-05T19:58:01.640Z

Link: CVE-2026-25793

cve-icon Vulnrichment

Updated: 2026-02-09T15:19:13.630Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-06T23:15:54.830

Modified: 2026-02-09T16:08:55.263

Link: CVE-2026-25793

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-09T10:45:10Z

Weaknesses