{"id":"CVE-2026-63446","state":"PUBLISHED","title":"Suricata app-layer: passed flows can retain transactions, causing resource exhaustion","description":"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.","publishedAt":"2026-09-18T20:22:15.562Z","updatedAt":"2026-09-21T16:20:22.712Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["OISF suricata"],"affected":[{"vendor":"OISF","product":"suricata","versions":[{"version":">= 8.0.0, < 8.0.6","status":"affected"}]}],"references":["https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m","https://github.com/OISF/suricata/pull/15726","https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","https://github.com/OISF/suricata/releases/tag/suricata-8.0.6","https://redmine.openinfosecfoundation.org/issues/8628"],"weaknesses":["CWE-401","CWE-407"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63446.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63446","state":"PUBLISHED","datePublished":"2026-09-18T20:22:15.562Z","dateUpdated":"2026-09-21T16:20:22.712Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-16T19:35:57.767Z"},"containers":{"cna":{"title":"Suricata app-layer: passed flows can retain transactions, causing resource exhaustion","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"OISF","product":"suricata","versions":[{"version":">= 8.0.0, < 8.0.6","status":"affected"}]}],"references":[{"url":"https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m","name":"https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/OISF/suricata/pull/15726","name":"https://github.com/OISF/suricata/pull/15726","tags":["x_refsource_MISC"]},{"url":"https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","name":"https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","tags":["x_refsource_MISC"]},{"url":"https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","name":"https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","tags":["x_refsource_MISC"]},{"url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6","name":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6","tags":["x_refsource_MISC"]},{"url":"https://redmine.openinfosecfoundation.org/issues/8628","name":"https://redmine.openinfosecfoundation.org/issues/8628","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-401","lang":"en","description":"CWE-401: Missing Release of Memory after Effective Lifetime","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-18T20:22:15.562Z"},"source":{"advisory":"GHSA-gjwr-75gq-877m","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-21T16:18:53.670399Z","id":"CVE-2026-63446","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-21T16:20:22.712Z"}}]}}}