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CVE-2026-61699— nebula-mesh: Certificate revocation is never enforced at the mesh

Quick assessment

Affected
forgekeep nebula-mesh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nebula-mesh 是一个自托管的 Slack Nebula 网格 VPN 控制平面。在 0.7.1 版本之前，吊销（revocation）是隔离已失陷或已离场主机的唯一带内机制。由于黑名单（blocklist）从未同步到任何对等节点的 config.yml 文件中，被标记为“已阻塞”的主机在最多 30 天（代理）/ 365 天（移动端）内，仍能通过其证书颁发机构（CA）下的每个对等节点及网格内的内部服务保持完全的覆盖网络可达性。攻击者若泄露了 host.key 和 host.crt，可以直接运行原版 slac

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
forgekeep nebula-mesh < 0.7.1 affected
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I. Basic Information for CVE-2026-61699

Vulnerability Information
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Vulnerability Title
nebula-mesh: Certificate revocation is never enforced at the mesh
Source: CVE Program / CVE List V5
Vulnerability Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.7.1, revocation is the only in-band mechanism that isolates a compromised/offboarded host from a Nebula mesh. Because the blocklist never reaches any peer's config.yml, a Blocked host retains full overlay reachability to every peer under its CA (and internal services on the mesh) for up to 30d (agent) / 365d (mobile). An attacker who exfiltrates host.key+host.crt can run stock slackhq/nebula directly, ignore the agent's 403/410 poll responses, and stay connected after the operator revokes the host. Operator-visible state (UI shows blocked, audit log records it) is misleading. This issue has been patched in version 0.7.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书撤销验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
forgekeep nebula-mesh < 0.7.1 -

II. Public POCs for CVE-2026-61699

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III. Intelligence Information for CVE-2026-61699

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Patches & Fixes for CVE-2026-61699 (1)

Vendor Advisories for CVE-2026-61699 (1)

Vendor Pages for CVE-2026-61699 (1)

Same Patch Batch · forgekeep · 2026-09-04 · 7 CVEs total

CVE-2026-63464 7.7 HIGH Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_priva
CVE-2026-53603 7.1 HIGH nebula-mesh: Operator session tokens stored in plaintext in the database
CVE-2026-53604 7.1 HIGH nebula-mesh: CA private key not zeroized on web mobile-bundle error paths
CVE-2026-53602 6.9 MEDIUM nebula-mesh - Host revocation is not durable: blocked/offboarded hosts can regain a valid
CVE-2026-55513 5.4 MEDIUM nebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hou
CVE-2026-55512 5.3 MEDIUM nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entri

IV. Related Vulnerabilities

Same product: nebula-mesh
Same vendor: forgekeep
Same weakness: CWE-299

V. Comments for CVE-2026-61699

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