CVE-2026-7776Boundary Workers Vulnerable to Denial of Service During TLS Handshake
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- HashiCorp
- NVD analysis
- Deferred
- Record last updated
- May 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
HashiCorp Boundary hashicorp:boundary (from the name) | from 0.9.0 before 0.21.3; fixed at 0.19.5, fixed at 0.20.3, fixed at 0.21.3 | CNA record |
HashiCorp Boundary Enterprise hashicorp:boundary_enterprise (from the name) | from 0.9.0 before 0.21.3; fixed at 0.19.5, fixed at 0.20.3, fixed at 0.21.3 | CNA record |
References
- https://discuss.hashicorp.com/t/hcsec-2026-11-boundary-workers-vulnerable-to-denial-of-service-during-tls-handshake
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.