{"id":"CVE-2026-63446","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. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and ma…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-401","CWE-407"],"vendor":"OISF","product":"suricata","affected":["suricata >= 8.0.0, < 8.0.6"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:17:39.643","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63446","references":[{"url":"https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","label":"security-advisories@github.com"},{"url":"https://github.com/OISF/suricata/pull/15726","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-gjwr-75gq-877m","label":"security-advisories@github.com"},{"url":"https://redmine.openinfosecfoundation.org/issues/8628","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"epss":0.00388,"epssPercentile":0.32646,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-21T16:18:53.670399Z"},"ingestedAt":"2026-09-18T20:51:25.796Z","slug":"CVE-2026-63446","body":"## Overview\n\nSuricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}