CVE-2026-46405Network attack vectorHinoki check available

Storage exhaustion via orphaned Kerberos token creation

Published Aug 7, 2026 · Updated Aug 7, 2026

Resource exhaustion in OpenBao before 2.5.4 allows remote attackers to consume storage through unauthenticated Kerberos requests. The Kerberos GET handler returns an empty logical.Auth object with an error, so core request handling creates a default token that the error hides from the caller. The path requires no authentication, and repeated requests accumulate unreachable tokens without exposing their values, eventually interrupting service as storage is consumed.

CVSS severity5.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Resource exhaustion in OpenBao before 2.5.4 allows remote attackers to consume storage through unauthenticated Kerberos requests. The Kerberos GET handler returns an empty logical.Auth object with an error, so core request handling creates a default token that the error hides from the caller. The path requires no authentication, and repeated requests accumulate unreachable tokens without exposing their values, eventually interrupting service as storage is consumed.

The record

CVE
CVE-2026-46405
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
OpenBao
Product
OpenBao
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBao · OpenBaoversion=< 2.5.4

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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