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Vulnerability Details :

CVE-2026-25793

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-06 Feb, 2026 | 22:55
Updated At-09 Feb, 2026 | 15:25
Rejected At-
Credits

Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:06 Feb, 2026 | 22:55
Updated At:09 Feb, 2026 | 15:25
Rejected At:
▼CVE Numbering Authority (CNA)
Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability

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.

Affected Products
Vendor
slackhq
Product
nebula
Versions
Affected
  • >= 1.7.0, < 1.10.3
Problem Types
TypeCWE IDDescription
CWECWE-347CWE-347: Improper Verification of Cryptographic Signature
Type: CWE
CWE ID: CWE-347
Description: CWE-347: Improper Verification of Cryptographic Signature
Metrics
VersionBase scoreBase severityVector
4.07.6HIGH
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
Version: 4.0
Base score: 7.6
Base severity: HIGH
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962
x_refsource_CONFIRM
https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21
x_refsource_MISC
Hyperlink: https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:06 Feb, 2026 | 23:15
Updated At:09 Feb, 2026 | 16:08

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.6HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 7.6
Base severity: HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-347Primarysecurity-advisories@github.com
CWE ID: CWE-347
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21security-advisories@github.com
N/A
https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962security-advisories@github.com
N/A
Hyperlink: https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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