CVE-2026-39388: OpenBao is an open source identity-based secrets management system

Q: How do I fix CVE-2026-39388?

openbao: upgrade to 2.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-39388 being exploited?

CVE-2026-39388 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39388 affect?

CVE-2026-39388 affects openbao. Severity is low (CVSS 3.1). 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 req

Q: How urgent is CVE-2026-39388?

Priority 11/100. No elevated risk signals yet.

Routine

LOW 3.1UPGRADE

CVE-2026-39388 is a low-severity flaw (CVSS 3.1) affecting openbao. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 request's presented mTLS certificate matches the original. Token renewals for other authentication methods do not require any supplied login information. Due to incorrect matching, the certificate authentication m

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-04-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: openbao

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 01:16 UTCPublished CVE record published
2026-06-17 10:42 UTCUpdated Record last modified

openbao openbao UPGRADE

Affected: < 2.5.3

Fixed in: 2.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openbao || rpm -q openbao || openbao --version

2. UPGRADE to 2.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openbao

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openbao

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39388?

openbao: upgrade to 2.5.3. Exact commands for each OS are on this page.

Is CVE-2026-39388 being exploited?

CVE-2026-39388 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39388 affect?

CVE-2026-39388 affects openbao. Severity is low (CVSS 3.1). 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 req

How urgent is CVE-2026-39388?

Priority 11/100. No elevated risk signals yet.

Related CVEs

CVE-2026-42186 HIGH 7.5 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-40264 LOW 2.7 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-39946 MEDIUM 4.9 UPGRADE OpenBao is an open source identity-based secrets management system
CVE-2026-39396 LOW 3.1 UPGRADE OpenBao is an open source identity-based secrets management system

References

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