{"id":"CVE-2026-63448","aliases":["GHSA-hvvj-c8xx-9g35"],"url":"https://o3.security/vulnerability/CVE-2026-63448","summary":"Suricata smb: some SMB flows can cause resource exhaustion","details":"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 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.","published":"2026-09-18T20:20:01.185Z","modified":"2026-09-25T08:27:38.703342Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476","label":"OISF/suricata@755d6c3"},"references":[{"type":"WEB","url":"https://github.com/OISF/suricata/releases/tag/suricata-7.0.17"},{"type":"WEB","url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"},{"type":"WEB","url":"https://redmine.openinfosecfoundation.org/issues/8629"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63448.json"},{"type":"ADVISORY","url":"https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63448"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-25T08:27:38.703342Z"}}