OESA-2026-4493 (CVE-2026-107708)
Vulnerability from osv_openeuler – Published: 2026-10-22 14:35 – Updated: 2026-10-22 14:35 – Source websiteKerberos 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)
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"aarch64": [
"krb5-1.21.2-23.oe2403sp4.aarch64.rpm",
"krb5-client-1.21.2-23.oe2403sp4.aarch64.rpm",
"krb5-debuginfo-1.21.2-23.oe2403sp4.aarch64.rpm",
"krb5-debugsource-1.21.2-23.oe2403sp4.aarch64.rpm",
"krb5-devel-1.21.2-23.oe2403sp4.aarch64.rpm",
"krb5-libs-1.21.2-23.oe2403sp4.aarch64.rpm",
"krb5-server-1.21.2-23.oe2403sp4.aarch64.rpm"
],
"noarch": [
"krb5-help-1.21.2-23.oe2403sp4.noarch.rpm"
],
"src": [
"krb5-1.21.2-23.oe2403sp4.src.rpm"
],
"x86_64": [
"krb5-1.21.2-23.oe2403sp4.x86_64.rpm",
"krb5-client-1.21.2-23.oe2403sp4.x86_64.rpm",
"krb5-debuginfo-1.21.2-23.oe2403sp4.x86_64.rpm",
"krb5-debugsource-1.21.2-23.oe2403sp4.x86_64.rpm",
"krb5-devel-1.21.2-23.oe2403sp4.x86_64.rpm",
"krb5-libs-1.21.2-23.oe2403sp4.x86_64.rpm",
"krb5-server-1.21.2-23.oe2403sp4.x86_64.rpm"
]
},
"package": {
"ecosystem": "openEuler:24.03-LTS-SP4",
"name": "krb5",
"purl": "pkg:rpm/openEuler/krb5\u0026distro=openEuler-24.03-LTS-SP4"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.2-23.oe2403sp4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"severity": "Medium"
},
"details": "Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.\r\n\r\nSecurity Fix(es):\n\nMIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC\u0026apos;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)\n\nMIT 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)",
"id": "OESA-2026-4493",
"modified": "2026-10-22T14:35:47Z",
"published": "2026-10-22T14:35:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4493"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107708"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107778"
}
],
"schema_version": "1.7.2",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "krb5 security update",
"upstream": [
"CVE-2026-107708",
"CVE-2026-107778"
]
}
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