SB20260824127 - Multiple vulnerabilities in Apache Kerby

Description

This security bulletin contains information about 2 vulnerabilities.

1) Uncontrolled Recursion (CVE-ID: CVE-2026-57914)

CWE-ID: CWE-674 - Uncontrolled Recursion

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in ASN1 parsing in kerby-asn1 when processing a deeply nested ASN1 structure. A remote attacker can send a specially crafted deeply nested ASN1 structure to cause a denial of service.

2) Improper Authentication (CVE-ID: CVE-2026-57915)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to bypass kerberos pre-authentication.

The vulnerability exists due to improper authentication in kerb-server when processing PA-DATA with an unrecognized or unsupported type. A remote attacker can send a specially crafted PA-DATA value to bypass kerberos pre-authentication.

Remediation

Install update from vendor's website.

References

• https://lists.apache.org/api/email.lua?id=cm1pzm66cm7zlsoh9v8fvfg3wzc2yzg6
• https://lists.apache.org/api/email.lua?id=3d08wnn0z49mxofyqvo8613kqpsoxdo2