CVE-2026-63464 json
Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`
published 3mo ago modified 2mo ago also GHSA-7rx3-5wx3-5v76 , GO-2026-5985 , EUVD-2026-71721
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard — letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.
Patch / fix
- go github.com/forgekeep/nebula-mesh 0.7.2
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Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| GitHub | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/forgekeep/nebula-mesh | >=0.6.0, <0.7.2 |
0.7.2 |
Affected products
- forgekeep nebula-mesh
Classification
References
Sources
- CVE List CVE-2026-63464
- GitHub Advisory GHSA-7rx3-5wx3-5v76
- NVD CVE-2026-63464
- OSV GO-2026-5985
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