usn-8585-1
Vulnerability from osv_ubuntu
Published
2026-07-22 13:04
Modified
2026-07-22 13:04
Summary
krb5 vulnerabilities
Details
It was discovered that Kerberos had an integer underflow vulnerability in the berval2tl_data() function. An attacker could possibly use this issue to cause Kerberos to crash, resulting in a denial of service. (CVE-2026-11850)
It was discovered that Kerberos had vulnerabilities in its NegoEx mechanism parsing. A remote attacker could possibly use these issues to cause Kerberos to crash, resulting in a denial of service. (CVE-2026-40355, CVE-2026-40356)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-11850",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-40355",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-40356",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "krb5-user",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libgssrpc4",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libkadm5clnt-mit12",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libkadm5srv-mit12",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libkdb5-10",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libkrad0",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.19.2-2ubuntu0.8"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.19.2-2ubuntu0.8"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "krb5",
"purl": "pkg:deb/ubuntu/krb5@1.19.2-2ubuntu0.8?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.19.2-2ubuntu0.8"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.18.3-6",
"1.18.3-7",
"1.19.2-0ubuntu1",
"1.19.2-1",
"1.19.2-2",
"1.19.2-2ubuntu0.1",
"1.19.2-2ubuntu0.2",
"1.19.2-2ubuntu0.3",
"1.19.2-2ubuntu0.4",
"1.19.2-2ubuntu0.5",
"1.19.2-2ubuntu0.6",
"1.19.2-2ubuntu0.7"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-11850",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-40355",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-40356",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "krb5-user",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libgssrpc4t64",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libkadm5clnt-mit12",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libkadm5srv-mit12",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libkdb5-10t64",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libkrad0",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.20.1-6ubuntu2.7"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.20.1-6ubuntu2.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "krb5",
"purl": "pkg:deb/ubuntu/krb5@1.20.1-6ubuntu2.7?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.1-6ubuntu2.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.20.1-3ubuntu1",
"1.20.1-5build1",
"1.20.1-6ubuntu1",
"1.20.1-6ubuntu2",
"1.20.1-6ubuntu2.1",
"1.20.1-6ubuntu2.2",
"1.20.1-6ubuntu2.3",
"1.20.1-6ubuntu2.4",
"1.20.1-6ubuntu2.5",
"1.20.1-6ubuntu2.6"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-11850",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-40355",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-40356",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "krb5-user",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libgssrpc4t64",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libkadm5clnt-mit12",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libkadm5srv-mit12",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libkdb5-10t64",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libkrad0",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.22.1-2ubuntu4.1"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.22.1-2ubuntu4.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "krb5",
"purl": "pkg:deb/ubuntu/krb5@1.22.1-2ubuntu4.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.1-2ubuntu4.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.21.3-5ubuntu2",
"1.22.1-2",
"1.22.1-2ubuntu2",
"1.22.1-2ubuntu3",
"1.22.1-2ubuntu4"
]
}
],
"aliases": [],
"details": "It was discovered that Kerberos had an integer underflow vulnerability\nin the berval2tl_data() function. An attacker could possibly use this issue\nto cause Kerberos to crash, resulting in a denial of service.\n(CVE-2026-11850)\n\nIt was discovered that Kerberos had vulnerabilities in its NegoEx mechanism\nparsing. A remote attacker could possibly use these issues to cause\nKerberos to crash, resulting in a denial of service. (CVE-2026-40355,\nCVE-2026-40356)",
"id": "USN-8585-1",
"modified": "2026-07-22T13:04:35Z",
"published": "2026-07-22T13:04:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8585-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-11850"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-40355"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-40356"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "krb5 vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-11850",
"UBUNTU-CVE-2026-40355",
"UBUNTU-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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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