{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-61548", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-10T16:27:03.094Z", "datePublished": "2026-09-18T16:54:28.925Z", "dateUpdated": "2026-09-18T17:11:33.491Z"}, "containers": {"cna": {"title": "Rsyslog: mmpstrucdata stack buffer overflow with oversized RFC5424 structured data", "problemTypes": [{"descriptions": [{"cweId": "CWE-121", "lang": "en", "description": "CWE-121: Stack-based Buffer Overflow", "type": "CWE"}]}], "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"}}], "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"}], "affected": [{"vendor": "rsyslog", "product": "rsyslog", "versions": [{"version": ">= 7.5.4, < 8.2606.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-18T16:54:28.925Z"}, "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'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."}], "source": {"advisory": "GHSA-8qmr-c66f-g368", "discovery": "UNKNOWN"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/07/20/1"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-18T17:11:33.491Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "rsyslog", "vendor": "rsyslog", "versions": [{"status": "affected", "version": ">= 7.5.4, < 8.2606.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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'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."}], "id": "CVE-2026-61548", "lastModified": "2026-09-18T18:17:08.103", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-18T17:16:58.190", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/rsyslog/rsyslog/commit/bcda60a3692efdf0c8e44102528f5a0ebe0dec6d"}, {"source": "security-advisories@github.com", "url": "https://github.com/rsyslog/rsyslog/pull/6991"}, {"source": "security-advisories@github.com", "url": "https://github.com/rsyslog/rsyslog/releases/tag/v8.2606.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-8qmr-c66f-g368"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/07/20/1"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{}