WID-SEC-W-2026-1290
Vulnerability from csaf_certbund - Published: 2026-04-27 22:00 - Updated: 2026-06-02 22:00Summary
MIT Kerberos: Mehrere Schwachstellen ermöglichen Denial of Service
Severity
Mittel
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Kerberos ist ein verteilter Netzwerkdienst zur Authentifizierung. MIT Kerberos ist die freie Implementierung des "Kerberos network authentication protocol", des Massachusetts Institute of Technology (MIT).
Angriff: Ein Angreifer kann mehrere Schwachstellen in MIT Kerberos ausnutzen, um einen Denial of Service Angriff durchzuführen.
Betroffene Betriebssysteme: - Linux
- UNIX
- Windows
Affected products
Known affected
9 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Enterprise Linux Update Infrastructure 5.1
Red Hat / Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:update_infrastructure_5.1
|
Update Infrastructure 5.1 | |
|
Red Hat Enterprise Linux Cryostat <4.2.0
Red Hat / Enterprise Linux
|
Cryostat <4.2.0 | ||
|
SUSE Linux
SUSE
|
cpe:/o:suse:suse_linux:-
|
— | |
|
Red Hat Enterprise Linux
Red Hat / Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:-
|
— | |
|
SUSE openSUSE
SUSE
|
cpe:/o:suse:opensuse:-
|
— | |
|
Debian Linux
Debian
|
cpe:/o:debian:debian_linux:-
|
— | |
|
Oracle Linux
Oracle
|
cpe:/o:oracle:linux:-
|
— | |
|
RESF Rocky Linux
RESF
|
cpe:/o:resf:rocky_linux:-
|
— | |
|
Fedora Linux
Fedora
|
cpe:/o:fedoraproject:fedora:-
|
— |
Affected products
Known affected
9 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Enterprise Linux Update Infrastructure 5.1
Red Hat / Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:update_infrastructure_5.1
|
Update Infrastructure 5.1 | |
|
Red Hat Enterprise Linux Cryostat <4.2.0
Red Hat / Enterprise Linux
|
Cryostat <4.2.0 | ||
|
SUSE Linux
SUSE
|
cpe:/o:suse:suse_linux:-
|
— | |
|
Red Hat Enterprise Linux
Red Hat / Enterprise Linux
|
cpe:/o:redhat:enterprise_linux:-
|
— | |
|
SUSE openSUSE
SUSE
|
cpe:/o:suse:opensuse:-
|
— | |
|
Debian Linux
Debian
|
cpe:/o:debian:debian_linux:-
|
— | |
|
Oracle Linux
Oracle
|
cpe:/o:oracle:linux:-
|
— | |
|
RESF Rocky Linux
RESF
|
cpe:/o:resf:rocky_linux:-
|
— | |
|
Fedora Linux
Fedora
|
cpe:/o:fedoraproject:fedora:-
|
— |
References
25 references
{
"document": {
"aggregate_severity": {
"text": "mittel"
},
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "de-DE",
"notes": [
{
"category": "legal_disclaimer",
"text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
},
{
"category": "description",
"text": "Kerberos ist ein verteilter Netzwerkdienst zur Authentifizierung. MIT Kerberos ist die freie Implementierung des \"Kerberos network authentication protocol\", des Massachusetts Institute of Technology (MIT).",
"title": "Produktbeschreibung"
},
{
"category": "summary",
"text": "Ein Angreifer kann mehrere Schwachstellen in MIT Kerberos ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
"title": "Angriff"
},
{
"category": "general",
"text": "- Linux\n- UNIX\n- Windows",
"title": "Betroffene Betriebssysteme"
}
],
"publisher": {
"category": "other",
"contact_details": "csaf-provider@cert-bund.de",
"name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
"namespace": "https://www.bsi.bund.de"
},
"references": [
{
"category": "self",
"summary": "WID-SEC-W-2026-1290 - CSAF Version",
"url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1290.json"
},
{
"category": "self",
"summary": "WID-SEC-2026-1290 - Portal Version",
"url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1290"
},
{
"category": "external",
"summary": "Cem\u0027s Blog vom 2026-04-27 mit PoC",
"url": "https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"
},
{
"category": "external",
"summary": "OSS Security Mailing List vom 2026-04-27",
"url": "https://seclists.org/oss-sec/2026/q2/235"
},
{
"category": "external",
"summary": "krb5 Fix vom 2026-04-27",
"url": "https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f"
},
{
"category": "external",
"summary": "Fedora Security Advisory FEDORA-2026-2E9FE57A46 vom 2026-04-29",
"url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-2e9fe57a46"
},
{
"category": "external",
"summary": "Fedora Security Advisory FEDORA-2026-8B43EA2F82 vom 2026-04-29",
"url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-8b43ea2f82"
},
{
"category": "external",
"summary": "Fedora Security Advisory FEDORA-2026-6C99AAA6D3 vom 2026-04-29",
"url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-6c99aaa6d3"
},
{
"category": "external",
"summary": "Fedora Security Advisory FEDORA-2026-684396998A vom 2026-04-29",
"url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-684396998a"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:12220 vom 2026-04-30",
"url": "https://access.redhat.com/errata/RHSA-2026:12220"
},
{
"category": "external",
"summary": "openSUSE Security Update OPENSUSE-SU-2026:10729-1 vom 2026-05-11",
"url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/CGQDIGY7A2NYHA7RFMRH6ORESGTIUR7C/"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:16799 vom 2026-05-13",
"url": "https://access.redhat.com/errata/RHSA-2026:16799"
},
{
"category": "external",
"summary": "Rocky Linux Security Advisory RLSA-2026:16799 vom 2026-05-14",
"url": "https://errata.build.resf.org/RLSA-2026:16799"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2026-16799 vom 2026-05-15",
"url": "http://linux.oracle.com/errata/ELSA-2026-16799.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:1816-1 vom 2026-05-13",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-May/026022.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:21629-1 vom 2026-05-15",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-May/026063.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:21618-1 vom 2026-05-15",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-May/026073.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:21641-1 vom 2026-05-15",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-May/026051.html"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:19357 vom 2026-05-20",
"url": "https://access.redhat.com/errata/RHSA-2026:19357"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:19145 vom 2026-05-19",
"url": "https://access.redhat.com/errata/RHSA-2026:19145"
},
{
"category": "external",
"summary": "Debian Security Advisory DSA-6293 vom 2026-05-23",
"url": "https://security-tracker.debian.org/tracker/DSA-6293-1"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:17789 vom 2026-05-26",
"url": "https://access.redhat.com/errata/RHSA-2026:17789"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:21275 vom 2026-05-27",
"url": "https://access.redhat.com/errata/RHSA-2026:21275"
},
{
"category": "external",
"summary": "Debian Security Advisory DLA-4603 vom 2026-05-28",
"url": "https://lists.debian.org/debian-lts-announce/2026/05/msg00047.html"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:22634 vom 2026-06-02",
"url": "https://access.redhat.com/errata/RHSA-2026:22634"
}
],
"source_lang": "en-US",
"title": "MIT Kerberos: Mehrere Schwachstellen erm\u00f6glichen Denial of Service",
"tracking": {
"current_release_date": "2026-06-02T22:00:00.000+00:00",
"generator": {
"date": "2026-06-03T06:12:33.559+00:00",
"engine": {
"name": "BSI-WID",
"version": "1.6.0"
}
},
"id": "WID-SEC-W-2026-1290",
"initial_release_date": "2026-04-27T22:00:00.000+00:00",
"revision_history": [
{
"date": "2026-04-27T22:00:00.000+00:00",
"number": "1",
"summary": "Initiale Fassung"
},
{
"date": "2026-04-29T22:00:00.000+00:00",
"number": "2",
"summary": "Neue Updates von Fedora aufgenommen"
},
{
"date": "2026-05-03T22:00:00.000+00:00",
"number": "3",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-05-11T22:00:00.000+00:00",
"number": "4",
"summary": "Neue Updates von openSUSE aufgenommen"
},
{
"date": "2026-05-12T22:00:00.000+00:00",
"number": "5",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-05-14T22:00:00.000+00:00",
"number": "6",
"summary": "Neue Updates von Rocky Enterprise Software Foundation, Oracle Linux und SUSE aufgenommen"
},
{
"date": "2026-05-17T22:00:00.000+00:00",
"number": "7",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2026-05-19T22:00:00.000+00:00",
"number": "8",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-05-25T22:00:00.000+00:00",
"number": "9",
"summary": "Neue Updates von Debian und Red Hat aufgenommen"
},
{
"date": "2026-05-27T22:00:00.000+00:00",
"number": "10",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-05-28T22:00:00.000+00:00",
"number": "11",
"summary": "Neue Updates von Debian aufgenommen"
},
{
"date": "2026-06-02T22:00:00.000+00:00",
"number": "12",
"summary": "Neue Updates von Red Hat aufgenommen"
}
],
"status": "final",
"version": "12"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "Debian Linux",
"product": {
"name": "Debian Linux",
"product_id": "T054613",
"product_identification_helper": {
"cpe": "cpe:/o:debian:debian_linux:-"
}
}
}
],
"category": "vendor",
"name": "Debian"
},
{
"branches": [
{
"category": "product_name",
"name": "Fedora Linux",
"product": {
"name": "Fedora Linux",
"product_id": "74185",
"product_identification_helper": {
"cpe": "cpe:/o:fedoraproject:fedora:-"
}
}
}
],
"category": "vendor",
"name": "Fedora"
},
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=1.18",
"product": {
"name": "MIT Kerberos \u003e=1.18",
"product_id": "T053362"
}
},
{
"category": "product_version_range",
"name": "\u003e=1.18",
"product": {
"name": "MIT Kerberos \u003e=1.18",
"product_id": "T053362-fixed"
}
}
],
"category": "product_name",
"name": "Kerberos"
}
],
"category": "vendor",
"name": "MIT"
},
{
"branches": [
{
"category": "product_name",
"name": "Oracle Linux",
"product": {
"name": "Oracle Linux",
"product_id": "T004914",
"product_identification_helper": {
"cpe": "cpe:/o:oracle:linux:-"
}
}
}
],
"category": "vendor",
"name": "Oracle"
},
{
"branches": [
{
"category": "product_name",
"name": "RESF Rocky Linux",
"product": {
"name": "RESF Rocky Linux",
"product_id": "T032255",
"product_identification_helper": {
"cpe": "cpe:/o:resf:rocky_linux:-"
}
}
}
],
"category": "vendor",
"name": "RESF"
},
{
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "Red Hat Enterprise Linux",
"product": {
"name": "Red Hat Enterprise Linux",
"product_id": "67646",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:enterprise_linux:-"
}
}
},
{
"category": "product_version_range",
"name": "Cryostat \u003c4.2.0",
"product": {
"name": "Red Hat Enterprise Linux Cryostat \u003c4.2.0",
"product_id": "T054651"
}
},
{
"category": "product_version",
"name": "Cryostat 4.2.0",
"product": {
"name": "Red Hat Enterprise Linux Cryostat 4.2.0",
"product_id": "T054651-fixed",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:enterprise_linux:cryostat__4.2.0"
}
}
},
{
"category": "product_version",
"name": "Update Infrastructure 5.1",
"product": {
"name": "Red Hat Enterprise Linux Update Infrastructure 5.1",
"product_id": "T054761",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:enterprise_linux:update_infrastructure_5.1"
}
}
}
],
"category": "product_name",
"name": "Enterprise Linux"
}
],
"category": "vendor",
"name": "Red Hat"
},
{
"branches": [
{
"category": "product_name",
"name": "SUSE Linux",
"product": {
"name": "SUSE Linux",
"product_id": "T002207",
"product_identification_helper": {
"cpe": "cpe:/o:suse:suse_linux:-"
}
}
},
{
"category": "product_name",
"name": "SUSE openSUSE",
"product": {
"name": "SUSE openSUSE",
"product_id": "T027843",
"product_identification_helper": {
"cpe": "cpe:/o:suse:opensuse:-"
}
}
}
],
"category": "vendor",
"name": "SUSE"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-40355",
"product_status": {
"known_affected": [
"T054761",
"T054651",
"T002207",
"67646",
"T027843",
"T054613",
"T004914",
"T032255",
"74185"
]
},
"release_date": "2026-04-27T22:00:00.000+00:00",
"title": "CVE-2026-40355"
},
{
"cve": "CVE-2026-40356",
"product_status": {
"known_affected": [
"T054761",
"T054651",
"T002207",
"67646",
"T027843",
"T054613",
"T004914",
"T032255",
"74185"
]
},
"release_date": "2026-04-27T22:00:00.000+00:00",
"title": "CVE-2026-40356"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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