UBUNTU-CVE-2026-61548
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.
UBUNTU-CVE-2026-61548
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:UBUNTU-CVE-2026-61548
rsyslog
Source reference: /affected/0/package/name
- Affected versions
- 5.8.11-2ubuntu4
Source reference:
/affected/0/versions7.4.4-1ubuntu1Source reference:
/affected/0/versions7.4.4-1ubuntu2Source reference:
/affected/0/versions7.4.4-1ubuntu2.1Source reference:
/affected/0/versions7.4.4-1ubuntu2.3Source reference:
/affected/0/versions7.4.4-1ubuntu2.5Source reference:
/affected/0/versions7.4.4-1ubuntu2.6Source reference:
/affected/0/versions7.4.4-1ubuntu2.7Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
rsyslog
Source reference: /affected/1/package/name
- Affected versions
- 8.12.0-1ubuntu2
Source reference:
/affected/1/versions8.12.0-1ubuntu3Source reference:
/affected/1/versions8.14.0-2ubuntu1Source reference:
/affected/1/versions8.14.0-2ubuntu2Source reference:
/affected/1/versions8.16.0-1ubuntu1Source reference:
/affected/1/versions8.16.0-1ubuntu2Source reference:
/affected/1/versions8.16.0-1ubuntu3Source reference:
/affected/1/versions8.16.0-1ubuntu3.1Source reference:
/affected/1/versions8.16.0-1ubuntu3.1+esm1Source reference:
/affected/1/versions8.16.0-1ubuntu3.1+esm2Source reference:
/affected/1/versions8.16.0-1ubuntu3.1+esm3Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
rsyslog
Source reference: /affected/2/package/name
- Affected versions
- 8.16.0-1ubuntu9
Source reference:
/affected/2/versions8.16.0-1ubuntu10Source reference:
/affected/2/versions8.32.0-1ubuntu3Source reference:
/affected/2/versions8.32.0-1ubuntu4Source reference:
/affected/2/versions8.32.0-1ubuntu4.2Source reference:
/affected/2/versions8.32.0-1ubuntu4.2+esm1Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
rsyslog
Source reference: /affected/3/package/name
- Affected versions
- 8.1901.0-1ubuntu4
Source reference:
/affected/3/versions8.2001.0-1ubuntu1Source reference:
/affected/3/versions8.2001.0-1ubuntu1.1Source reference:
/affected/3/versions8.2001.0-1ubuntu1.3Source reference:
/affected/3/versions8.2001.0-1ubuntu1.3+esm1Source reference:
/affected/3/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
rsyslog
Source reference: /affected/4/package/name
- Affected versions
- 8.2102.0-2ubuntu2
Source reference:
/affected/4/versions8.2110.0-3ubuntu1Source reference:
/affected/4/versions8.2110.0-3ubuntu2Source reference:
/affected/4/versions8.2110.0-4ubuntu1Source reference:
/affected/4/versions8.2112.0-2ubuntu2Source reference:
/affected/4/versions8.2112.0-2ubuntu2.2Source reference:
/affected/4/versions - Fixed versions
- 8.2112.0-2ubuntu2.4
Source reference:
/affected/4/ranges - Prerequisites
- Not stated in this record
rsyslog
Source reference: /affected/5/package/name
- Affected versions
- 8.2306.0-2ubuntu2
Source reference:
/affected/5/versions8.2312.0-3ubuntu1Source reference:
/affected/5/versions8.2312.0-3ubuntu2Source reference:
/affected/5/versions8.2312.0-3ubuntu3Source reference:
/affected/5/versions8.2312.0-3ubuntu7Source reference:
/affected/5/versions8.2312.0-3ubuntu8Source reference:
/affected/5/versions8.2312.0-3ubuntu9Source reference:
/affected/5/versions8.2312.0-3ubuntu9.1Source reference:
/affected/5/versions8.2312.0-3ubuntu9.2Source reference:
/affected/5/versions - Fixed versions
- 8.2312.0-3ubuntu9.3
Source reference:
/affected/5/ranges - Prerequisites
- Not stated in this record
rsyslog
Source reference: /affected/6/package/name
- Affected versions
- 8.2504.0-1ubuntu2
Source reference:
/affected/6/versions8.2512.0-1ubuntu2Source reference:
/affected/6/versions8.2512.0-1ubuntu3Source reference:
/affected/6/versions8.2512.0-1ubuntu4Source reference:
/affected/6/versions - Fixed versions
- 8.2512.0-1ubuntu4.1
Source reference:
/affected/6/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
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"package": {
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"purl": "pkg:deb/ubuntu/rsyslog?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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"8.16.0-1ubuntu10",
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"8.32.0-1ubuntu4.2",
"8.32.0-1ubuntu4.2+esm1"
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{
"binary_name": "rsyslog-elasticsearch",
"binary_version": "8.32.0-1ubuntu4.2+esm1"
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"binary_version": "8.32.0-1ubuntu4.2+esm1"
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"binary_name": "rsyslog-relp",
"binary_version": "8.32.0-1ubuntu4.2+esm1"
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"package": {
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"purl": "pkg:deb/ubuntu/rsyslog?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"8.1901.0-1ubuntu4",
"8.2001.0-1ubuntu1",
"8.2001.0-1ubuntu1.1",
"8.2001.0-1ubuntu1.3",
"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"
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"ecosystem_specific": {
"binaries": [
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{
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"binary_version": "8.2001.0-1ubuntu1.3+esm1"
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{
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"binary_version": "8.2001.0-1ubuntu1.3+esm1"
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"binary_version": "8.2001.0-1ubuntu1.3+esm1"
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"binary_version": "8.2001.0-1ubuntu1.3+esm1"
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"8.2112.0-2ubuntu2",
"8.2112.0-2ubuntu2.2"
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"binary_version": "8.2112.0-2ubuntu2.4"
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"binary_version": "8.2112.0-2ubuntu2.4"
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{
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"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"
},
{
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"binary_version": "8.2112.0-2ubuntu2.4"
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{
"binary_name": "rsyslog-mongodb",
"binary_version": "8.2112.0-2ubuntu2.4"
},
{
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"binary_version": "8.2112.0-2ubuntu2.4"
},
{
"binary_name": "rsyslog-openssl",
"binary_version": "8.2112.0-2ubuntu2.4"
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{
"binary_name": "rsyslog-pgsql",
"binary_version": "8.2112.0-2ubuntu2.4"
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},
{
"binary_name": "rsyslog-snmp",
"binary_version": "8.2112.0-2ubuntu2.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
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"events": [
{
"introduced": "0"
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{
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}
],
"package": {
"name": "rsyslog",
"purl": "pkg:deb/ubuntu/rsyslog?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
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"8.2312.0-3ubuntu2",
"8.2312.0-3ubuntu3",
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"8.2312.0-3ubuntu8",
"8.2312.0-3ubuntu9",
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},
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"binaries": [
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"binary_version": "8.2312.0-3ubuntu9.3"
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{
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},
{
"binary_name": "rsyslog-mongodb",
"binary_version": "8.2312.0-3ubuntu9.3"
},
{
"binary_name": "rsyslog-mysql",
"binary_version": "8.2312.0-3ubuntu9.3"
},
{
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},
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},
{
"binary_name": "rsyslog-snmp",
"binary_version": "8.2312.0-3ubuntu9.3"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
],
"package": {
"name": "rsyslog",
"purl": "pkg:deb/ubuntu/rsyslog?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"8.2512.0-1ubuntu2",
"8.2512.0-1ubuntu3",
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61548.json"
},
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"binaries": [
{
"binary_name": "rsyslog",
"binary_version": "8.2512.0-1ubuntu4.1"
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"binary_version": "8.2512.0-1ubuntu4.1"
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"binary_version": "8.2512.0-1ubuntu4.1"
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{
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{
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{
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"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"
}
],
"availability": "No subscription required"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #5805 · Revision 1
- Added to Heist Feed
- Publisher date