DoS in Boundary Workers TLS Handshake (fixed 0.21.3, 0.20.3, 0.19.5)
CVE-2026-7776 Published on May 4, 2026
Boundary Workers Vulnerable to Denial of Service During TLS Handshake
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.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-7776
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Affected Versions
HashiCorp Boundary:- Version 0.9.0 and below 0.21.3 is affected.
- Version 0.9.0 and below 0.21.3 is affected.