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.
History

Mon, 28 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*

Mon, 21 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 20 Sep 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared Oisf
Oisf suricata
Vendors & Products Oisf
Oisf suricata

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title Suricata app-layer: passed flows can retain transactions, causing resource exhaustion
Weaknesses CWE-401
CWE-407
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-18T20:22:15.562Z

Updated: 2026-09-21T16:20:22.712Z

Reserved: 2026-07-16T19:35:57.767Z

Link: CVE-2026-63446

cve-icon Vulnrichment

Updated: 2026-09-21T16:20:18.285Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-18T21:17:03.763

Modified: 2026-09-28T18:34:40.520

Link: CVE-2026-63446

cve-icon Redhat

No data.