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CVE-2026-46405— OpenBao's Kerberos Auth Method Accumulates Unaccessible Tokens

Quick assessment

Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBao是OpenBao组织开源的一款提供加密与身份权限管理功能的软件。 OpenBao 2.5.4之前版本存在资源管理错误漏洞，该漏洞源于Kerberos认证方法的GET处理程序或提供Authorization: Negotiate标头时响应包含logical.Auth对象和错误信息，可能导致创建仅具有默认策略、默认TTL且无实体信息的令牌，但调用者无法访问这些令牌。

CVSS 5.3 · Medium EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
openbao openbao < 2.5.4 affected
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I. Basic Information for CVE-2026-46405

Vulnerability Information
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Vulnerability Title
OpenBao's Kerberos Auth Method Accumulates Unaccessible Tokens
Source: CVE Program / CVE List V5
Vulnerability Description
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.4, in OpenBao's Kerberos auth method on the `GET` handler, or when an `Authorization: Negotiate` header is supplied, the response is includes a `logical.Auth` object in addition to an error message. This results in tokens being created with only the default policy, default TTL, and no entity information, which are hidden by the returned error message. No access to these tokens by the caller occurs and the authentication token is not ever made accessible outside of `sys/raw`. This is fixed in OpenBao v2.5.4. As a workaround, users may set a rate limit quota to limit the creation of these paths. As the path is unauthenticated, it isn't possible to deny access to it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBao 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBao是OpenBao组织开源的一款提供加密与身份权限管理功能的软件。 OpenBao 2.5.4之前版本存在资源管理错误漏洞，该漏洞源于Kerberos认证方法的GET处理程序或提供Authorization: Negotiate标头时响应包含logical.Auth对象和错误信息，可能导致创建仅具有默认策略、默认TTL且无实体信息的令牌，但调用者无法访问这些令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.4 -

II. Public POCs for CVE-2026-46405

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III. Intelligence Information for CVE-2026-46405

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Patches & Fixes for CVE-2026-46405 (2)

Vendor Advisories for CVE-2026-46405 (1)

Vendor Pages for CVE-2026-46405 (1)

Same Patch Batch · openbao · 2026-08-07 · 3 CVEs total

CVE-2026-45808 7.1 HIGH OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL
CVE-2026-46358 5.4 MEDIUM OpenBao's Inline Auth Incorrectly Redacted Headers

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-770

V. Comments for CVE-2026-46405

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