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Vulnerability · Published Aug 7, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity resource allocation without limits in openbao from openbao. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.6%top 50.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23openbao2.5.4-r0ALPINE-CVE-2026-46405
Alpine:v3.24openbao2.5.4-r0ALPINE-CVE-2026-46405
Gogithub.com/openbao/openbao2.5.4GHSA-7j6w-vvw2-5f9c
Gogithub.com/openbao/openbaono fix listedGO-2026-5225

Affected products (as reported)

VendorProductVersions
openbao openbao < 2.5.4

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References