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6 vulnerabilities found for Nebula by Slack
CVE-2026-25793 (GCVE-0-2026-25793)
Vulnerability from nvd – Published: 2026-02-06 22:55 – Updated: 2026-02-09 15:25
VLAI
Title
Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/slackhq/nebula/security/adviso… | x_refsource_CONFIRM |
| https://github.com/slackhq/nebula/commit/f573e8a2… | x_refsource_MISC |
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CVE-2025-62820 (GCVE-0-2025-62820)
Vulnerability from nvd – Published: 2025-10-23 00:00 – Updated: 2025-10-23 14:35
VLAI
Summary
Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-420 - Unprotected Alternate Channel
Assigner
References
2 references
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CVE-2020-11498 (GCVE-0-2020-11498)
Vulnerability from nvd – Published: 2020-04-02 22:13 – Updated: 2024-08-04 11:35
VLAI
Summary
Slack Nebula through 1.1.0 contains a relative path vulnerability that allows a low-privileged attacker to execute code in the context of the root user via tun_darwin.go or tun_windows.go. A user can also use Nebula to execute arbitrary code in the user's own context, e.g., for user-level persistence or to bypass security controls. NOTE: the vendor states that this "requires a high degree of access and other preconditions that are tough to achieve."
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/slackhq/nebula/pull/191 | x_refsource_MISC |
| http://www.pwn3d.org/posts/7918501-slack-nebula-r… | x_refsource_MISC |
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CVE-2026-25793 (GCVE-0-2026-25793)
Vulnerability from cvelistv5 – Published: 2026-02-06 22:55 – Updated: 2026-02-09 15:25
VLAI
Title
Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/slackhq/nebula/security/adviso… | x_refsource_CONFIRM |
| https://github.com/slackhq/nebula/commit/f573e8a2… | x_refsource_MISC |
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CVE-2025-62820 (GCVE-0-2025-62820)
Vulnerability from cvelistv5 – Published: 2025-10-23 00:00 – Updated: 2025-10-23 14:35
VLAI
Summary
Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-420 - Unprotected Alternate Channel
Assigner
References
2 references
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CVE-2020-11498 (GCVE-0-2020-11498)
Vulnerability from cvelistv5 – Published: 2020-04-02 22:13 – Updated: 2024-08-04 11:35
VLAI
Summary
Slack Nebula through 1.1.0 contains a relative path vulnerability that allows a low-privileged attacker to execute code in the context of the root user via tun_darwin.go or tun_windows.go. A user can also use Nebula to execute arbitrary code in the user's own context, e.g., for user-level persistence or to bypass security controls. NOTE: the vendor states that this "requires a high degree of access and other preconditions that are tough to achieve."
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/slackhq/nebula/pull/191 | x_refsource_MISC |
| http://www.pwn3d.org/posts/7918501-slack-nebula-r… | x_refsource_MISC |
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