High severity · published Jun 26, 2026
CVE-2026-57915
Apache Kerby: Kerberos Pre-Authentication Bypass
7.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AK
Apache Kerby · Apache Software Foundation
before 2.1.2 · source: vendor
RH
Red Hat AMQ Clients · Red Hat
All versions, or not specified · source: CISA
SF
streams for Apache Kafka 2 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57915
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57915
lists.apache.org
https://lists.apache.org/thread/1y3glgh3kzwoxo5m2lq504cjlh1dsrfh
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/06/26/8
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-57915
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2493407
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57915.json
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