CVE-2026-7776
Deferred Deferred - Pending Action
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
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.
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Meta Information
Published
2026-05-04
Last Modified
2026-05-04
Generated
2026-06-16
AI Q&A
2026-05-05
EPSS Evaluated
2026-06-14
NVD
CVE-2026-7776
EUVD
EUVD-2026-27145
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
hashicorp boundary 0.21.3
hashicorp boundary 0.20.3
hashicorp boundary 0.19.5
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Boundary to one of the fixed versions: 0.21.3, 0.20.3, or 0.19.5.

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