CVE-2026-26158
Full vulnerability record from the local CVENow database.
Description
A flaw was found in BusyBox. This vulnerability allows an attacker to modify files outside of the intended extraction directory by crafting a malicious tar archive containing unvalidated hardlink or symlink entries. If the tar archive is extracted with elevated privileges, this flaw can lead to privilege escalation, enabling an attacker to gain unauthorized access to critical system files.
Severity
HIGH
CVSS score
7.0
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2026-02-11 21:16:21.607000
Last modified
2026-11-04 23:17:26.200000
View original CVE JSON
{
"id": "CVE-2026-26158",
"sourceIdentifier": "[email protected]",
"published": "2026-02-11T21:16:21.607",
"lastModified": "2026-11-04T23:17:26.200",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in BusyBox. This vulnerability allows an attacker to modify files outside of the intended extraction directory by crafting a malicious tar archive containing unvalidated hardlink or symlink entries. If the tar archive is extracted with elevated privileges, this flaw can lead to privilege escalation, enabling an attacker to gain unauthorized access to critical system files."
},
{
"lang": "es",
"value": "Se encontró una falla en BusyBox. Esta vulnerabilidad permite a un atacante modificar archivos fuera del directorio de extracción previsto al crear un archivo tar malicioso que contiene entradas de hardlink o symlink no validadas. Si el archivo tar se extrae con privilegios elevados, esta falla puede conducir a una escalada de privilegios, permitiendo a un atacante obtener acceso no autorizado a archivos críticos del sistema."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat Hardened Images",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "busybox-main",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"versions": [
{
"version": "1.37.0-7.2.hum1",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 6",
"defaultStatus": "unknown",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "busybox",
"cpes": [
"cpe:/o:redhat:rhel_els:6"
]
}
]
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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"packageName": "busybox-main",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"versions": [
{
"version": "1.37.0-7.2.hum1",
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}
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},
{
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"packageName": "busybox",
"cpes": [
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]
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
"vendor": "Siemens",
"product": "RUGGEDCOM RST2428P",
"defaultStatus": "unknown",
"versions": [
{
"version": "0",
"lessThan": "V4.0",
"versionType": "custom",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.0,
"impactScore": 5.9
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
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}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-02-12T04:55:24.841610Z",
"id": "CVE-2026-26158",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-73"
}
]
},
{
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],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:13831",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-26158",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439040",
"source": "[email protected]"
},
{
"url": "https://git.busybox.net/busybox/commit/archival?id=3fb6b31c716669e12f75a2accd31bb7685b1a1cb",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:13831",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-26158",
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},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439040",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
},
{
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26158.json",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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}