CVE-2026-40264: OpenBao is an open source identity-based secrets management system

Q: How do I fix CVE-2026-40264?

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

Q: Is CVE-2026-40264 being exploited?

CVE-2026-40264 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-2026-40264 affect?

CVE-2026-40264 affects openbao. Severity is low (CVSS 2.7). OpenBao is an open source identity-based secrets management system. OpenBao's namespaces provide multi-tenant separation. Prior to version 2.5.3, a tenant who leaks token accessors can have their token revoked or renewed by a privileged adm

Q: How urgent is CVE-2026-40264?

Priority 15/100. No elevated risk signals yet.

Routine

LOW 2.7UPGRADE

CVE-2026-40264 is a low-severity flaw (CVSS 2.7) 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. OpenBao's namespaces provide multi-tenant separation. Prior to version 2.5.3, a tenant who leaks token accessors can have their token revoked or renewed by a privileged administrator in another tenant. This is addressed in v2.5.3.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.7 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-1259
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 10:44 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-2026-40264?

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

Is CVE-2026-40264 being exploited?

CVE-2026-40264 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-2026-40264 affect?

CVE-2026-40264 affects openbao. Severity is low (CVSS 2.7). OpenBao is an open source identity-based secrets management system. OpenBao's namespaces provide multi-tenant separation. Prior to version 2.5.3, a tenant who leaks token accessors can have their token revoked or renewed by a privileged adm

How urgent is CVE-2026-40264?

Priority 15/100. 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-2026-39946 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
CVE-2026-39388 LOW 3.1 UPGRADE OpenBao is an open source identity-based secrets management system

References

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