CVE-2026-7776
Denial-of-Service in Boundary Workers via TLS Handshake Delay
Publication date: 2026-05-04
Last updated on: 2026-05-04
Assigner: HashiCorp Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| hashicorp | boundary | 0.21.3 |
| hashicorp | boundary | 0.20.3 |
| hashicorp | boundary | 0.19.5 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects Boundary Community Edition and Boundary Enterprise workers during the TLS handshake process when enrolling nodes. An attacker with network access to the worker authentication listener can open a connection and then delay or withhold the client certificate required for the TLS handshake. This causes the worker connection handling to block, leading to a denial-of-service condition.
How can this vulnerability impact me? :
The impact of this vulnerability is a denial-of-service condition where legitimate worker connections may be prevented from being accepted or routed. This can disrupt normal operations by blocking worker connections, potentially causing service interruptions.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade Boundary to one of the fixed versions: 0.21.3, 0.20.3, or 0.19.5.