{"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":"2026-09-21T20:49:39.195Z"},"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"}},{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-18T19:24:39.206415Z","id":"CVE-2026-61548","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-21T20:49:39.195Z"}}]}}