Vulnerability-Lookup

UBUNTU-CVE-2026-61548 (CVE-2026-61548)

Vulnerability from osv_ubuntu – Published: 2026-07-20 00:00 – Updated: 2026-09-23 23:31 – Source website

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.

Severity

8.1 (High)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-61548	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-61548	REPORT
	https://github.com/rsyslog/rsyslog/security/advis…	REPORT
	https://ubuntu.com/security/notices/USN-8598-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@7.4.4-1ubuntu2.7?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.8.11-2ubuntu4",
        "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": "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.16.0-1ubuntu3.1+esm3?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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": "8.32.0-1ubuntu4.2+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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.32.0-1ubuntu4.2+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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": "8.2001.0-1ubuntu1.3+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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2001.0-1ubuntu1.3+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    },
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2112.0-2ubuntu2.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2112.0-2ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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": "8.2312.0-3ubuntu9.3"
          },
          {
            "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2312.0-3ubuntu9.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2312.0-3ubuntu9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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": "8.2512.0-1ubuntu4.1"
          },
          {
            "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2512.0-1ubuntu4.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2512.0-1ubuntu4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.2504.0-1ubuntu2",
        "8.2512.0-1ubuntu2",
        "8.2512.0-1ubuntu3",
        "8.2512.0-1ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "Rsyslog is a rocket-fast system for log processing. From 7.5.4 until 8.2606.0, the optional mmpstrucdata plugin\u0027s 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.",
  "id": "UBUNTU-CVE-2026-61548",
  "modified": "2026-09-23T23:31:26Z",
  "published": "2026-07-20T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-61548"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-61548"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8598-1"
    }
  ],
  "related": [
    "USN-8598-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-61548"
  ]
}

CVE-2026-61548 (GCVE-0-2026-61548)

Vulnerability from cvelistv5 – Published: 2026-09-18 16:54 – Updated: 2026-09-21 20:49

Title

Rsyslog: mmpstrucdata stack buffer overflow with oversized RFC5424 structured data

Summary

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 19:24 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M mitre root Scorecard

References

5 references

URL	Tags
https://github.com/rsyslog/rsyslog/security/advis…	x_refsource_CONFIRM
https://github.com/rsyslog/rsyslog/pull/6991	x_refsource_MISC
https://github.com/rsyslog/rsyslog/commit/bcda60a…	x_refsource_MISC
https://github.com/rsyslog/rsyslog/releases/tag/v…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/07/20/1

Impacted products

1 product

Vendor	Product	Version
rsyslog	rsyslog	Affected: >= 7.5.4, < 8.2606.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-18T17:11:33.491Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/20/1"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-61548",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-18T19:24:39.206415Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-21T20:49:39.195Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "rsyslog",
          "vendor": "rsyslog",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 7.5.4, \u003c 8.2606.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Rsyslog is a rocket-fast system for log processing. From 7.5.4 until 8.2606.0, the optional mmpstrucdata plugin\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-121",
              "description": "CWE-121: Stack-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T16:54:28.925Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368"
        },
        {
          "name": "https://github.com/rsyslog/rsyslog/pull/6991",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rsyslog/rsyslog/pull/6991"
        },
        {
          "name": "https://github.com/rsyslog/rsyslog/commit/bcda60a3692efdf0c8e44102528f5a0ebe0dec6d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rsyslog/rsyslog/commit/bcda60a3692efdf0c8e44102528f5a0ebe0dec6d"
        },
        {
          "name": "https://github.com/rsyslog/rsyslog/releases/tag/v8.2606.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rsyslog/rsyslog/releases/tag/v8.2606.0"
        }
      ],
      "source": {
        "advisory": "GHSA-8qmr-c66f-g368",
        "discovery": "UNKNOWN"
      },
      "title": "Rsyslog: mmpstrucdata stack buffer overflow with oversized RFC5424 structured data"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61548",
    "datePublished": "2026-09-18T16:54:28.925Z",
    "dateReserved": "2026-07-10T16:27:03.094Z",
    "dateUpdated": "2026-09-21T20:49:39.195Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

USN-8598-1 (UBUNTU-CVE-2026-61548)

Vulnerability from osv_ubuntu – Published: 2026-07-23 14:26 – Updated: 2026-09-21 07:01 – Source website

Summary

rsyslog vulnerabilities

Details

It was discovered that rsyslog incorrectly handled regex-based TCP framing in the imptcp module. A remote attacker could possibly use this issue to cause rsyslog to crash, resulting in a denial of service.

It was discovered that rsyslog incorrectly handled oversized RFC5424 structured data in the mmpstrucdata module. A remote attacker could possibly use this issue to cause rsyslog to crash, resulting in a denial of service. (CVE-2026-61548)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8598-1	ADVISORY
	https://ubuntu.com/security/CVE-2026-61548	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-61548",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2112.0-2ubuntu2.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2112.0-2ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-61548",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2312.0-3ubuntu9.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2312.0-3ubuntu9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-61548",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rsyslog",
        "purl": "pkg:deb/ubuntu/rsyslog@8.2512.0-1ubuntu4.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2512.0-1ubuntu4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.2504.0-1ubuntu2",
        "8.2512.0-1ubuntu2",
        "8.2512.0-1ubuntu3",
        "8.2512.0-1ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that rsyslog incorrectly handled regex-based TCP framing\nin the imptcp module. A remote attacker could possibly use this issue to\ncause rsyslog to crash, resulting in a denial of service.\n\nIt was discovered that rsyslog incorrectly handled oversized RFC5424\nstructured data in the mmpstrucdata module. A remote attacker could\npossibly use this issue to cause rsyslog to crash, resulting in a denial of\nservice. (CVE-2026-61548)",
  "id": "USN-8598-1",
  "modified": "2026-09-21T07:01:10Z",
  "published": "2026-07-23T14:26:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8598-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-61548"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "rsyslog vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-61548"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

UBUNTU-CVE-2026-61548 (CVE-2026-61548)

CVE-2026-61548 (GCVE-0-2026-61548)

USN-8598-1 (UBUNTU-CVE-2026-61548)

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