Apache Kerby: Kerberos Pre-Authentication Bypass

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Summary

CVECVE-2026-57915
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 13:16:35 UTC
Updated2026-06-26 19:16:45 UTC
DescriptionIt is possible to bypass the Kerberos pre-authentication check in Apache Kerby by sending a PA-DATA with an unrecognized or unsupported type. Users are recommended to upgrade to version 2.1.2, which fixes this issue.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from ADP

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

Problem Types: CWE-304 | CWE-304 CWE-304 Missing Critical Step in Authentication

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Kerby affected 2.1.2 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread/1y3glgh3kzwoxo5m2lq504cjlh1dsrfh [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/06/26/8 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
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