Vulnerability · Published May 4, 2026 · Assigned by HashiCorp
CVE-2026-7776Boundary Workers Vulnerable to Denial of Service During TLS Handshake
High 7.5
In plain English
A high-severity resource allocation without limits in Boundary from HashiCorp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/hashicorp/boundary | 0.19.5 | GHSA-7x9r-wcgg-w86f |
| Go | github.com/hashicorp/boundary | 0.20.3 | GHSA-7x9r-wcgg-w86f |
| Go | github.com/hashicorp/boundary | 0.21.3 | GHSA-7x9r-wcgg-w86f |
| Go | github.com/hashicorp/boundary | 0.19.5, 0.20.3, 0.21.3 | GO-2026-5237 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| HashiCorp | Boundary | 0.9.0 – before 0.21.3 |
| HashiCorp | Boundary Enterprise | 0.9.0 – before 0.21.3 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H