USN-8786-1

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Source
https://ubuntu.com/security/notices/USN-8786-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8786-1
Upstream
Related
Published
2026-09-21T12:22:06Z
Modified
2026-09-21T21:42:45Z
Summary
rsyslog vulnerability
Details

It was discovered that rsyslog incorrectly calculated buffer sizes when replacing strings. A remote attacker could possibly use this issue to cause rsyslog to crash, resulting in a denial of service.

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

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-78002",
            "severity":  [
                {
                    "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"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.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

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-78002",
            "severity":  [
                {
                    "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"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.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

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-78002",
            "severity":  [
                {
                    "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"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.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

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-78002",
            "severity":  [
                {
                    "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:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.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

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-78002",
            "severity":  [
                {
                    "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:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.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

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-78002",
            "severity":  [
                {
                    "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:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8786-1.json"