CVE-2026-7776

Boundary Workers Vulnerable to Denial of Service During TLS Handshake

Published May 4, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-7x9r-wcgg-w86f Hashicorp Boundary workers are vulnerable to a denial-of-service condition during node enrollment TLS handshakes
History
Type Values Removed Values Added
First Time appeared Hashicorp
Hashicorp boundary
Hashicorp boundary Enterprise
Vendors & Products Hashicorp
Hashicorp boundary
Hashicorp boundary Enterprise
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Boundary Workers Vulnerable to Denial of Service During TLS Handshake
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
HashiCorp
Published
Updated
May 5, 2026, 2:14 PM
Reserved
May 4, 2026, 3:10 PM
Status
Deferred
Published
May 4, 2026, 10:16 PM
Modified
Oct 26, 2026, 7:10 PM