CVE-2026-63446
Suricata app-layer: passed flows can retain transactions, causing resource exhaustion
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-401 CWE-407 |
| Vendor | oisf |
| Product | suricata |
| Published | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
OISF / suricata
>= 8.0.0, < 8.0.6
References
github.com: https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m github.com: https://github.com/OISF/suricata/pull/15726 github.com: https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8 github.com: https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7 github.com: https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 redmine.openinfosecfoundation.org: https://redmine.openinfosecfoundation.org/issues/8628