{"id":"CVE-2026-63446","summary":"Suricata app-layer: passed flows can retain transactions, causing resource exhaustion","details":"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 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.","aliases":["GHSA-gjwr-75gq-877m"],"modified":"2026-09-20T14:13:50.428262Z","published":"2026-09-18T20:22:15.562Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63446.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-401","CWE-407"]},"references":[{"type":"WEB","url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"},{"type":"WEB","url":"https://redmine.openinfosecfoundation.org/issues/8628"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63446.json"},{"type":"ADVISORY","url":"https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63446"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7"},{"type":"FIX","url":"https://github.com/OISF/suricata/pull/15726"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/oisf/suricata","events":[{"introduced":"9956286fb89f9cad9e9f95b99dc751f8666617b7"},{"fixed":"006e21c1ccc38c1c815e7945d54b4638cc5f0de8"},{"fixed":"60a83c62a1dfdfb589b2bad27fb7fc339fc964b7"},{"fixed":"4c28cc1b4ac64f48efdca6ce3e09748227a04a7e"}],"database_specific":{"extracted_events":[{"introduced":"8.0.0"},{"fixed":"8.0.6"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["suricata-8.0.5","suricata-8.0.4","suricata-8.0.3","suricata-8.0.2","suricata-8.0.1","suricata-8.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63446.json","vanir_signatures_modified":"2026-09-20T14:13:50Z","vanir_signatures":[{"target":{"file":"src/app-layer-parser.c","function":"AppLayerParserSetTransactionInspectId"},"deprecated":false,"digest":{"function_hash":"321937884697169245306301473532313770868","length":2329},"id":"CVE-2026-63446-58547ac5","signature_type":"Function","signature_version":"v1","source":"https://github.com/oisf/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7"},{"target":{"file":"src/app-layer-parser.c"},"deprecated":false,"digest":{"line_hashes":["155113365947798130156823041632571564156","52650437962713573936225784256195878123","339124585535717827244690750159969374338","1303721136460442916085878764767480729","180982446793788181687714942280706398942","52650437962713573936225784256195878123","84106185547474231223537990732649229501","42420818197809979725328273319796657245"],"threshold":0.9},"id":"CVE-2026-63446-86295b0b","signature_type":"Line","signature_version":"v1","source":"https://github.com/oisf/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8"},{"id":"CVE-2026-63446-a43c537c","signature_type":"Function","signature_version":"v1","source":"https://github.com/oisf/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","target":{"file":"src/app-layer-parser.c","function":"AppLayerParserSetTransactionInspectId"},"deprecated":false,"digest":{"function_hash":"321937884697169245306301473532313770868","length":2329}},{"source":"https://github.com/oisf/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","target":{"file":"src/app-layer-parser.c"},"deprecated":false,"digest":{"line_hashes":["155113365947798130156823041632571564156","52650437962713573936225784256195878123","339124585535717827244690750159969374338","1303721136460442916085878764767480729","180982446793788181687714942280706398942","52650437962713573936225784256195878123","84106185547474231223537990732649229501","42420818197809979725328273319796657245"],"threshold":0.9},"id":"CVE-2026-63446-c148c5c8","signature_type":"Line","signature_version":"v1"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}