{"id":"CVE-2026-63448","title":"Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine","summary":"Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload …","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-401","CWE-407"],"vendor":"OISF","product":"suricata","affected":["suricata >= 8.0.0, < 8.0.6","suricata < 7.0.17"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:17:04.060","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63448","references":[{"url":"https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/releases/tag/suricata-7.0.17","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35","label":"security-advisories@github.com"},{"url":"https://redmine.openinfosecfoundation.org/issues/8629","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-18T20:51:25.796Z","epss":0.00439,"epssPercentile":0.3748,"slug":"CVE-2026-63448","body":"## Overview\n\nSuricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}