{"id":"AZL-103314","summary":"CVE-2026-61548 affecting package rsyslog 8.2308.0-6","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.","modified":"2026-09-19T14:16:10.039903242Z","published":"2026-09-18T17:16:58Z","upstream":["CVE-2026-61548"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61548"}],"affected":[{"package":{"name":"rsyslog","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/rsyslog"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"8.2308.0-6"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-103314.json"}}],"schema_version":"1.9.0"}