CVE-2026-78002
Full vulnerability record from the local CVENow database.
Description
A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-08-27 17:20:29.367000
Last modified
2026-10-26 17:17:29.953000
View original CVE JSON
{
"id": "CVE-2026-78002",
"sourceIdentifier": "[email protected]",
"published": "2026-08-27T17:20:29.367",
"lastModified": "2026-10-26T17:17:29.953",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10.2"
],
"versions": [
{
"version": "0:8.2510.0-5.el10_2.2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/o:redhat:enterprise_linux_eus:10.0"
],
"versions": [
{
"version": "0:8.2412.0-1.el10_0.2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:enterprise_linux:8::appstream"
],
"versions": [
{
"version": "0:8.2102.0-15.el8_10.3",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:rhel_e4s:8.8::appstream",
"cpe:/a:redhat:rhel_tus:8.8::appstream"
],
"versions": [
{
"version": "0:8.2102.0-13.el8_8.1",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:rhel_e4s:8.8::appstream",
"cpe:/a:redhat:rhel_tus:8.8::appstream"
],
"versions": [
{
"version": "0:8.2102.0-13.el8_8.1",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:enterprise_linux:9::appstream"
],
"versions": [
{
"version": "0:8.2510.0-2.el9_8.2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:rhel_e4s:9.2::appstream"
],
"versions": [
{
"version": "0:8.2102.0-113.el9_2.3",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:rhel_e4s:9.4::appstream"
],
"versions": [
{
"version": "0:8.2310.0-4.el9_4.2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/a:redhat:rhel_eus:9.6::appstream"
],
"versions": [
{
"version": "0:8.2412.0-1.el9_6.2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Update Infrastructure 5",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhui5/haproxy-rhel9",
"cpes": [
"cpe:/a:redhat:rhui:5::el9"
],
"versions": [
{
"version": "1790241900",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 6",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 6",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog7",
"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 7",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rsyslog",
"cpes": [
"cpe:/o:redhat:enterprise_linux:7"
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-27T18:29:21.461066Z",
"id": "CVE-2026-78002",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-131"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:69540",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:69541",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:71603",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:80817",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:81321",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:84576",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:86124",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:87408",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:90349",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-78002",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521135",
"source": "[email protected]"
},
{
"url": "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3",
"source": "[email protected]"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/08/29/1",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}