UBUNTU-CVE-2026-61548

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Source
https://ubuntu.com/security/CVE-2026-61548
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61548.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-61548
Upstream
Downstream
Related
Published
2026-07-20T00:00:00Z
Modified
2026-09-24T02:00:34Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Rsyslog is a rocket-fast system for log processing. From 7.5.4 until 8.2606.0, the optional mmpstrucdata plugin's parseSD_PARAM function in plugins/mmpstrucdata/mmpstrucdata.c stores RFC5424 parameter values in a fixed pVal[32 * 1024] stack buffer and calls parsePARAM_VALUE without supplying the destination size. A remote unauthenticated attacker whose crafted RFC5424 message reaches an action using mmpstrucdata can provide a structured-data parameter larger than that buffer when MaxMessageSize permits it, causing an attacker-controlled stack overwrite. Deployments that do not install and use the plugin, or whose effective message-size limit remains below the required threshold, are not affected by this issue. The demonstrated impact is a crash and interruption of log collection; code execution is not demonstrated. This issue is fixed in version 8.2606.0.

References

Affected packages

Ubuntu:14.04:LTS
rsyslog

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.8.11-2ubuntu4
7.*
7.4.4-1ubuntu1
7.4.4-1ubuntu2
7.4.4-1ubuntu2.1
7.4.4-1ubuntu2.3
7.4.4-1ubuntu2.5
7.4.4-1ubuntu2.6
7.4.4-1ubuntu2.7

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "7.4.4-1ubuntu2.7"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "7.4.4-1ubuntu2.7"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "7.4.4-1ubuntu2.7"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "7.4.4-1ubuntu2.7"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "7.4.4-1ubuntu2.7"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "7.4.4-1ubuntu2.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61548.json"
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
8.2112.0-2ubuntu2.4

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

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "rsyslog",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-czmq",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-elasticsearch",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-gnutls",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-gssapi",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-hiredis",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-kafka",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-kubernetes",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-mongodb",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-mysql",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-openssl",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-pgsql",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-relp",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        },
        {
            "binary_name":  "rsyslog-snmp",
            "binary_version":  "8.2112.0-2ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61548.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
8.2312.0-3ubuntu9.3

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

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61548.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
8.2512.0-1ubuntu4.1

Affected versions

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

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61548.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

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
8.16.0-1ubuntu3.1+esm3

Ecosystem specific 

{
    "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-2026-61548.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

Affected versions

8.*
8.16.0-1ubuntu9
8.16.0-1ubuntu10
8.32.0-1ubuntu3
8.32.0-1ubuntu4
8.32.0-1ubuntu4.2
8.32.0-1ubuntu4.2+esm1

Ecosystem specific 

{
    "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-2026-61548.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

Affected versions

8.*
8.1901.0-1ubuntu4
8.2001.0-1ubuntu1
8.2001.0-1ubuntu1.1
8.2001.0-1ubuntu1.3
8.2001.0-1ubuntu1.3+esm1

Ecosystem specific 

{
    "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-2026-61548.json"