CVE-2026-40264

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

Upgrade openbao to 2.5.3 or later.

Q: Is CVE-2026-40264 being actively exploited?

Not that we know of. CVE-2026-40264 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.30% is the estimated probability that it will be exploited in the next 30 days. That is higher than 22% of all scored CVEs.

Q: How severe is CVE-2026-40264?

CVE-2026-40264 has a CVSS v3 base score of 2.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-40264 affect?

Published advisories record a fix for openbao (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

LOW

2.7

CVSS v3

NVD

Description

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.

CWE-1259

How to fix

Remediation Available

openbaoNVD

Affected:< 2.5.3Fixed in:2.5.3CVE-2026-40264derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.30%probability of exploitation in 30 days

22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-1259 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-36111	Medium	6.3	8.4%	-	-
CVE-2022-23541	Medium	5.0	0.8%	-	Fix
CVE-2022-23551	Medium	5.3	0.7%	-	Fix
CVE-2024-36533	Critical	9.8	0.5%	-	-
CVE-2026-25700	High	7.2	0.4%	-	Fix
CVE-2025-50579	Medium	5.3	0.4%	-	-

Common questions

How do I fix CVE-2026-40264?

Upgrade openbao to 2.5.3 or later.

Is CVE-2026-40264 being actively exploited?

Not that we know of. CVE-2026-40264 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.30% is the estimated probability that it will be exploited in the next 30 days. That is higher than 22% of all scored CVEs.

How severe is CVE-2026-40264?

CVE-2026-40264 has a CVSS v3 base score of 2.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-40264 affect?

Published advisories record a fix for openbao (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-40264

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-24.