UBUNTU-CVE-2026-78002

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Source
https://ubuntu.com/security/CVE-2026-78002
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-78002
Upstream
  • CVE-2026-78002
Downstream
Related
Published
2026-08-27T17:20:00Z
Modified
2026-09-21T21:40:25Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:22.04:LTS
rsyslog

Package

Name
rsyslog
Purl
pkg:deb/ubuntu/rsyslog?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.2112.0-2ubuntu2.5

Affected versions

8.*
8.2102.0-2ubuntu2
8.2110.0-3ubuntu1
8.2110.0-3ubuntu2
8.2110.0-4ubuntu1
8.2112.0-2ubuntu2
8.2112.0-2ubuntu2.2
8.2112.0-2ubuntu2.4

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-czmq",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-hiredis",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-kafka",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-kubernetes",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-mongodb",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-openssl",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        },
        {
            "binary_name":  "rsyslog-snmp",
            "binary_version":  "8.2112.0-2ubuntu2.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json"
Ubuntu:24.04:LTS
rsyslog

Package

Name
rsyslog
Purl
pkg:deb/ubuntu/rsyslog?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.2312.0-3ubuntu9.4

Affected versions

8.*
8.2306.0-2ubuntu2
8.2312.0-3ubuntu1
8.2312.0-3ubuntu2
8.2312.0-3ubuntu3
8.2312.0-3ubuntu7
8.2312.0-3ubuntu8
8.2312.0-3ubuntu9
8.2312.0-3ubuntu9.1
8.2312.0-3ubuntu9.2
8.2312.0-3ubuntu9.3

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-czmq",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-hiredis",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-kafka",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-kubernetes",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-mongodb",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-openssl",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        },
        {
            "binary_name":  "rsyslog-snmp",
            "binary_version":  "8.2312.0-3ubuntu9.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json"
Ubuntu:26.04:LTS
rsyslog

Package

Name
rsyslog
Purl
pkg:deb/ubuntu/rsyslog?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.2512.0-1ubuntu4.2

Affected versions

8.*
8.2504.0-1ubuntu2
8.2512.0-1ubuntu2
8.2512.0-1ubuntu3
8.2512.0-1ubuntu4
8.2512.0-1ubuntu4.1

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-clickhouse",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-czmq",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-docker",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-hiredis",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-kafka",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-kubernetes",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-mongodb",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-openssl",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        },
        {
            "binary_name":  "rsyslog-snmp",
            "binary_version":  "8.2512.0-1ubuntu4.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json"
Ubuntu:Pro:16.04:LTS
rsyslog

Package

Name
rsyslog
Purl
pkg:deb/ubuntu/rsyslog?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.16.0-1ubuntu3.1+esm3

Affected versions

8.*
8.12.0-1ubuntu2
8.12.0-1ubuntu3
8.14.0-2ubuntu1
8.14.0-2ubuntu2
8.16.0-1ubuntu1
8.16.0-1ubuntu2
8.16.0-1ubuntu3
8.16.0-1ubuntu3.1
8.16.0-1ubuntu3.1+esm1
8.16.0-1ubuntu3.1+esm2

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.16.0-1ubuntu3.1+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json"
Ubuntu:Pro:18.04:LTS
rsyslog

Package

Name
rsyslog
Purl
pkg:deb/ubuntu/rsyslog?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.32.0-1ubuntu4.2+esm1

Affected versions

8.*
8.16.0-1ubuntu9
8.16.0-1ubuntu10
8.32.0-1ubuntu3
8.32.0-1ubuntu4
8.32.0-1ubuntu4.2

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-czmq",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-hiredis",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-kafka",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-mongodb",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.32.0-1ubuntu4.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json"
Ubuntu:Pro:20.04:LTS
rsyslog

Package

Name
rsyslog
Purl
pkg:deb/ubuntu/rsyslog?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.2001.0-1ubuntu1.3+esm1

Affected versions

8.*
8.1901.0-1ubuntu4
8.2001.0-1ubuntu1
8.2001.0-1ubuntu1.1
8.2001.0-1ubuntu1.3

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-czmq",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-hiredis",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-kafka",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-mongodb",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-openssl",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.2001.0-1ubuntu1.3+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78002.json"