{"schemaVersion":3,"id":"CVE-2026-63446","aliases":["UBUNTU-CVE-2026-63446","DEBIAN-CVE-2026-63446"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-09-18T20:22:15.562Z","modified":"2026-09-21T16:20:22.712Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00684,"percentile":0.51964,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.29599999999999993,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00388},"history":[{"date":"2026-09-19T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00684,"percentile":0.51964}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00388,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00684,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00684,"percentile":0.51964}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime","description":"The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/401.html"},{"id":"CWE-407","name":"Inefficient Algorithmic Complexity","description":"An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"Low","url":"https://cwe.mitre.org/data/definitions/407.html"}],"affected":[{"vendor":"debian","product":"suricata","name":"suricata","label":"suricata","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/suricata","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 1:8.0.6-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 1:8.0.6-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"suricata","name":"suricata","label":"suricata","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/suricata","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"oisf","product":"suricata","name":"suricata","label":"suricata","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 8.0.0, < 8.0.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 8.0.0, < 8.0.6","eol":null,"hubHref":"/vendor/oisf/suricata"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m","label":"github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT","Mitigation","Vendor Advisory"]},{"url":"https://github.com/OISF/suricata/pull/15726","label":"github.com/OISF/suricata/pull/15726","hostname":"github.com","tags":["X Refsource MISC","REPORT","Patch"]},{"url":"https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","label":"github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8","hostname":"github.com","tags":["X Refsource MISC","REPORT","Patch"]},{"url":"https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","label":"github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7","hostname":"github.com","tags":["X Refsource MISC","REPORT","Patch"]},{"url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6","label":"github.com/OISF/suricata/releases/tag/suricata-8.0.6","hostname":"github.com","tags":["X Refsource MISC","REPORT","Release Notes"]},{"url":"https://redmine.openinfosecfoundation.org/issues/8628","label":"redmine.openinfosecfoundation.org/issues/8628","hostname":"redmine.openinfosecfoundation.org","tags":["X Refsource MISC","REPORT","Permissions Required"]},{"url":"https://ubuntu.com/security/CVE-2026-63446","label":"ubuntu.com/security/CVE-2026-63446","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63446","label":"www.cve.org/CVERecord?id=CVE-2026-63446","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-63446","label":"security-tracker.debian.org/tracker/CVE-2026-63446","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-18T20:22:15.562Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-21T16:20:22.712Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T10:22:58.813Z","stale":false,"partial":false}}