Denial-of-Service Vulnerability in Boundary by HashiCorp
CVE-2026-7776

7.5HIGH

Key Information:

Vendor

Hashicorp
Status
Boundary
Boundary Enterprise
Vendor
CVE Published:
4 May 2026

What is CVE-2026-7776?

The Boundary Community Edition and Boundary Enterprise products developed by HashiCorp are exposed to a denial-of-service vulnerability during TLS handshakes related to node enrollment. An attacker with network access to the worker authentication listener can exploit this vulnerability by opening a connection and intentionally delaying or withholding the client certificate during the TLS handshake process. This action may lead to the blocking of worker connection handling, thereby hindering the acceptance or routing of legitimate worker connections. The vulnerability has been addressed in Boundary versions 0.21.3, 0.20.3, and 0.19.5.

Affected Version(s)

Boundary 64 bit 0.9.0 < 0.21.3

Boundary Enterprise 64 bit 0.9.0 < 0.21.3

References

https://discuss.hashicorp.com/t/hcsec-2026-11-boundary-wo...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was identified by the Boundary Engineering team.
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