Boundary Workers Vulnerable to Denial of Service During TLS Handshake
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
Boundary Community Edition and Boundary Enterprise (“Boundary”) workers are vulnerable to a denial-of-service condition during node enrollment TLS handshakes. An attacker with network access to the worker authentication listener may open a connection and delay or withhold the client certificate during the TLS handshake, causing worker connection handling to block. This may prevent legitimate worker connections from being accepted or routed. This vulnerability, CVE-2026-7776, is fixed in Boundary 0.21.3, 0.20.3, 0.19.5.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| HashiCorp | Boundary | 0.9.0 to before 0.21.3 | 0.21.3 | Patch available | CNA |
| HashiCorp | Boundary Enterprise | 0.9.0 to before 0.21.3 | 0.21.3 | Patch available | CNA |
| — | github.com/hashicorp/boundary (Go) | before 0.19.5 | 0.19.5 | Patch available | GHSA-7x9r-wcgg-w86f |
| — | github.com/hashicorp/boundary (Go) | 0.20.0 to before 0.20.3 | 0.20.3 | Patch available | GHSA-7x9r-wcgg-w86f |
| — | github.com/hashicorp/boundary (Go) | 0.21.0 to before 0.21.3 | 0.21.3 | Patch available | GHSA-7x9r-wcgg-w86f |
- Boundary VendorHashiCorp Affected 0.9.0 to before 0.21.3 Fixed in 0.21.3 Patch available CNA
- Boundary Enterprise VendorHashiCorp Affected 0.9.0 to before 0.21.3 Fixed in 0.21.3 Patch available CNA
- github.com/hashicorp/boundary (Go) Vendor— Affected before 0.19.5 Fixed in 0.19.5 Patch available GHSA-7x9r-wcgg-w86f
- github.com/hashicorp/boundary (Go) Vendor— Affected 0.20.0 to before 0.20.3 Fixed in 0.20.3 Patch available GHSA-7x9r-wcgg-w86f
- github.com/hashicorp/boundary (Go) Vendor— Affected 0.21.0 to before 0.21.3 Fixed in 0.21.3 Patch available GHSA-7x9r-wcgg-w86f
Remediation
- Fix · CNA Boundary (HashiCorp) Fixed in 0.21.3
- Fix · CNA Boundary Enterprise (HashiCorp) Fixed in 0.21.3
- Fix · GHSA-7x9r-wcgg-w86f github.com/hashicorp/boundary (Go) Fixed in 0.19.5 Advisory →
- Fix · GHSA-7x9r-wcgg-w86f github.com/hashicorp/boundary (Go) Fixed in 0.20.3 Advisory →
- Fix · GHSA-7x9r-wcgg-w86f github.com/hashicorp/boundary (Go) Fixed in 0.21.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-7776
- 2026-10-03 Alias added: GHSA-7x9r-wcgg-w86f
References
More HashiCorp vulnerabilities
- TI-2024-01904 Vault Cert Auth Method Did Not Correctly Validate Non-CA Certificates CVSS 3.1CRITICAL 9.8
- TI-2021-18437 HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4… CVSS 3.1HIGH 8.8
- TI-2026-06570 Nomad vulnerable to path traversal in dynamic host volume which may lead to code execution CVSS 3.1HIGH 8.8
- TI-2020-17753 The official Consul Docker images 0.7.1 through 1.4.2 contain a blank password for a root… CVSS 3.1CRITICAL 9.8
- TI-2026-13641 consul-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode CVSS 3.1CRITICAL 10.0
- TI-2026-13778 terraform-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode CVSS 3.1CRITICAL 10.0
Sources
- CVE-2026-7776 · CVE Program
- CVE-2026-7776 · NVD
- FIRST EPSS
- GHSA-7x9r-wcgg-w86f · GitHub Advisory Database · CC BY 4.0
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