OpenBao's Kerberos Auth Method Accumulates Unaccessible Tokens
Medium5.3CVE-2026-46405 · Published May 28, 2026 · updated Aug 17, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| github.com/openbao/openbao Go | < 2.5.4 | 2.5.4 |
Details and references
### Impact 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`. At most this could cause storage usage. ### Patches This is fixed in OpenBao v2.5.4. ### Workarounds 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. ### Reporter This was discovered by an anonymous reporter.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-770
- Also known as
- BIT-openbao-2026-46405, CVE-2026-46405, GO-2026-5225
More openbao advisories
All| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| May 28 | OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL CVE-2026-45808Highfixed in 2.5.4 | High | 2.5.4 |
| May 28 | OpenBao's Inline Auth Incorrectly Redacted Headers CVE-2026-46358Mediumfixed in 2.5.4 | Medium | 2.5.4 |
| May 5 | OpenBao's Namespace Deletion May Not Delete Data Properly CVE-2026-42186Lowfixed in 0.0.0-20260420173541-6d2e0506e2b4 | Low | 0.0.0-20260420173541-6d2e0506e2b4 |
| Jun 19 | OpenBao: LDAPi ldaputil (wrong escape func) CVE-2026-55770Medium6.8fixed in 0.0.0-20260617104213-10b7825c714c | Medium6.8 | 0.0.0-20260617104213-10b7825c714c |
| Jun 19 | OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew} , incomplete fix of CVE-2026-45808 CVE-2026-55774Lowfixed in 0.0.0-20260617103932-b20b999dd404 | Low | 0.0.0-20260617103932-b20b999dd404 |
| Jun 19 | OpenBao's System Backend allows Unauthorized Management of the containing Namespace CVE-2026-55775Lowfixed in 0.0.0-20260617103935-d3c1cc64b1ae | Low | 0.0.0-20260617103935-d3c1cc64b1ae |