What is CVE-2026-39388?

CVE-2026-39388 is a low-severity vulnerability in Openbao, classified under Improper Certificate Validation. CVSS score: 3.1/10. Published 2026-04-21.

How severe is CVE-2026-39388?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in Openbao

CVE-2026-39388

OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, OpenBao's Certificate authentication method, when a token renewal is requested and `disable_binding=true` is set, attempts to verify the current re…

Vulnerability class: Improper Certificate Validation

EPSS: 0.001 (1.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N.

Affected products

Openbao — versions < 2.5.3

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-39388?: CVE-2026-39388 is a low-severity vulnerability in Openbao, classified under Improper Certificate Validation. CVSS score: 3.1/10. Published 2026-04-21.
How severe is CVE-2026-39388?: Low severity. CVSS v3 base score is 3.1 out of 10.