OESA-2026-4491

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Source

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-4491

Import Source

https://repo.openeuler.org/security/data/osv/OESA-2026-4491.json

JSON Data

https://api.osv.dev/v1/vulns/OESA-2026-4491

Upstream

CVE (2)

Published

2026-10-22T14:35:46Z

Modified

2026-10-22T14:45:10Z

Severity

6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Summary

krb5 security update

Details

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.

Security Fix(es):

MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.(CVE-2026-107708)

MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.(CVE-2026-107778)

Database specific

{
    "severity":  "Medium"
}

References

Affected packages

openEuler:24.03-LTS-SP1 / krb5

Package

Name: krb5
Purl: pkg:rpm/openEuler/krb5&distro=openEuler-24.03-LTS-SP1

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.21.2-23.oe2403sp1

Ecosystem specific

{
    "aarch64":  [
        "krb5-1.21.2-23.oe2403sp1.aarch64.rpm",
        "krb5-client-1.21.2-23.oe2403sp1.aarch64.rpm",
        "krb5-debuginfo-1.21.2-23.oe2403sp1.aarch64.rpm",
        "krb5-debugsource-1.21.2-23.oe2403sp1.aarch64.rpm",
        "krb5-devel-1.21.2-23.oe2403sp1.aarch64.rpm",
        "krb5-libs-1.21.2-23.oe2403sp1.aarch64.rpm",
        "krb5-server-1.21.2-23.oe2403sp1.aarch64.rpm"
    ],
    "noarch":  [
        "krb5-help-1.21.2-23.oe2403sp1.noarch.rpm"
    ],
    "src":  [
        "krb5-1.21.2-23.oe2403sp1.src.rpm"
    ],
    "x86_64":  [
        "krb5-1.21.2-23.oe2403sp1.x86_64.rpm",
        "krb5-client-1.21.2-23.oe2403sp1.x86_64.rpm",
        "krb5-debuginfo-1.21.2-23.oe2403sp1.x86_64.rpm",
        "krb5-debugsource-1.21.2-23.oe2403sp1.x86_64.rpm",
        "krb5-devel-1.21.2-23.oe2403sp1.x86_64.rpm",
        "krb5-libs-1.21.2-23.oe2403sp1.x86_64.rpm",
        "krb5-server-1.21.2-23.oe2403sp1.x86_64.rpm"
    ]
}

Database specific

source

"https://repo.openeuler.org/security/data/osv/OESA-2026-4491.json"