CVE-2026-7776 — Boundary Workers Vulnerable to Denial of Service During TLS Handshake

Description (CNA)

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 (CNA)

Vendor / product	Versions
HashiCorp / Boundary	affected 0.9.0 before 0.21.3
HashiCorp / Boundary Enterprise	affected 0.9.0 before 0.21.3

CWE

CWE-770

References

https://discuss.hashicorp.com/t/hcsec-2026-11-boundary-workers-vulnerable-to-denial-of-service-during-tls-handshake

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.