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Fencer Vulns
high 7.3

CVE-2026-57915 json

Apache Kerby: Kerberos Pre-Authentication Bypass

published 2026-06-26 4 mo ago modified 2026-11-03 5 d ago also GHSA-262p-fj3f-xh7v , EUVD-2026-39650

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.kerby:kerb-server 2.1.2
  • Apache Software Foundation Apache Kerby 2.1.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-57915 updated cvss 7.3

Apache Kerby: org.apache.kerby/kerb-server: Apache Kerby: Kerberos pre-authentication bypass via unrecognized PA-DATA

  • Red Hat AMQ Clients 2026.Q3
    fixed: vendor fix RHSA-2026:69459
  • Red Hat Data Grid 8 kerb-server, kerb-server-api-all
    not affected: component not present
  • Red Hat Fuse 7 kerb-server
    not affected: vulnerable code not present
  • Red Hat JBoss Enterprise Application Platform Expansion Pack kerb-server, kerb-server-api-all
    not affected: component not present
  • Red Hat streams for Apache Kafka 2 kerb-server
    not affected: vulnerable code not present
  • Red Hat streams for Apache Kafka 3 kerb-server
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
GitHub 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
maven org.apache.kerby:kerb-server
<2.1.2
2.1.2

Affected products

  • Apache Software Foundation Apache Kerby
  • Red Hat Red Hat AMQ Clients
  • Red Hat Red Hat Data Grid 8
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat streams for Apache Kafka 2
  • Red Hat streams for Apache Kafka 3

Classification

Weakness
  • CWE-304 Missing Critical Step in Authentication
  • CWE-358 Improperly Implemented Security Check for Standard

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.