{"id":"DEBIAN-CVE-2026-61548","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":"2026-09-25T08:47:28.964303305Z","published":"2026-09-18T17:16:58.190Z","upstream":["CVE-2026-61548"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-61548"}],"affected":[{"package":{"name":"rsyslog","ecosystem":"Debian:12","purl":"pkg:deb/debian/rsyslog?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.2302.0-1","8.2302.0-1+deb12u1","8.2304.0-1","8.2306.0-1","8.2306.0-2","8.2308.0-1","8.2310.0-1","8.2310.0-2","8.2310.0-3","8.2310.0-4","8.2312.0-1","8.2312.0-2","8.2312.0-3","8.2402.0-1","8.2404.0-1","8.2404.0-2","8.2406.0-1","8.2408.0-1","8.2408.0-2","8.2410.0-1","8.2412.0-1","8.2412.0-2","8.2502.0-1","8.2502.0-2","8.2502.0-3","8.2502.0-4","8.2502.0-5","8.2502.0-6","8.2504.0-1","8.2506.0-1","8.2506.0-2","8.2506.0-3","8.2506.0-4","8.2506.0-6","8.2510.0-1","8.2510.0-2","8.2510.0-3","8.2510.0-4","8.2510.0-5","8.2512.0-1","8.2512.0-2","8.2512.0-3","8.2602.0-1","8.2604.0-1","8.2604.0-2","8.2604.0-3","8.2604.0-4","8.2606.0-1","8.2606.0-2","8.2606.0-3","8.2606.0-4","8.2608.0-1","8.2608.0-2","8.2608.0-3","8.2608.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61548.json"}},{"package":{"name":"rsyslog","ecosystem":"Debian:13","purl":"pkg:deb/debian/rsyslog?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.2504.0-1+deb13u2"}]}],"versions":["8.2504.0-1","8.2504.0-1+deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61548.json"}},{"package":{"name":"rsyslog","ecosystem":"Debian:14","purl":"pkg:deb/debian/rsyslog?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.2606.0-4"}]}],"versions":["8.2504.0-1","8.2506.0-1","8.2506.0-2","8.2506.0-3","8.2506.0-4","8.2506.0-6","8.2510.0-1","8.2510.0-2","8.2510.0-3","8.2510.0-4","8.2510.0-5","8.2512.0-1","8.2512.0-2","8.2512.0-3","8.2602.0-1","8.2604.0-1","8.2604.0-2","8.2604.0-3","8.2604.0-4","8.2606.0-1","8.2606.0-2","8.2606.0-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61548.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}