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CVE-2026-57915— Apache Kerby: Kerberos Pre-Authentication Bypass

Quick assessment

Affected
Apache Software Foundation Apache Kerby
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.

Apache Kerby是美国Apache基金会的一款Kerberos认证协议实现框架。 Apache Kerby 2.1.2之前版本存在授权问题漏洞，该漏洞源于发送未识别或不受支持的PA-DATA类型可绕过Kerberos预身份验证检查。

AI Predicted 7.5 Difficulty: Easy EPSS 0.53% · P45

Possible ATT&CK Techniques 1 AI

T1556.003 · Pluggable Authentication Modules

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache Kerby < 2.1.2 affected
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I. Basic Information for CVE-2026-57915

Vulnerability Information
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Vulnerability Title
Apache Kerby: Kerberos Pre-Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
It 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
认证中关键步骤缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Kerby 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Kerby是美国Apache基金会的一款Kerberos认证协议实现框架。 Apache Kerby 2.1.2之前版本存在授权问题漏洞，该漏洞源于发送未识别或不受支持的PA-DATA类型可绕过Kerberos预身份验证检查。
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
Apache Software Foundation Apache Kerby 0 ~ 2.1.2 -

II. Public POCs for CVE-2026-57915

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III. Intelligence Information for CVE-2026-57915

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Mailing List Discussions for CVE-2026-57915 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-26 · 5 CVEs total

CVE-2026-49486 Apache Airflow FTP provider: FTP Provider does not protect FTPS data channel (missing PROT
CVE-2026-57914 Apache Kerby: StackOverflow on parsing deeply nested ASN1 structures
CVE-2025-55017 Apache IoTDB: Path Traversal Vulnerability
CVE-2025-64152 Apache IoTDB: Path Traversal Vulnerability

IV. Related Vulnerabilities

Same product: Apache Kerby
Same vendor: Apache Software Foundation
Same weakness: CWE-304