Suricata app-layer: passed flows can retain transactions, causing resource exhaustion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63446
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:17:03 UTC
Updated2026-09-18 21:17:03 UTC
DescriptionSuricata 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003880000 probability, percentile 0.327560000 (date 2026-09-20)

Problem Types: CWE-401 | CWE-407 | CWE-401 CWE-401: Missing Release of Memory after Effective Lifetime | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OISF Suricata affected >= 8.0.0, < 8.0.6 Not specified

References

ReferenceSourceLinkTags
github.com/OISF/suricata/pull/15726 [email protected] github.com
redmine.openinfosecfoundation.org/issues/8628 [email protected] redmine.openinfosecfoundation.org
github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7 [email protected] github.com
github.com/OISF/suricata/releases/tag/suricata-8.0.6 [email protected] github.com
github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m [email protected] github.com
github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8 [email protected] github.com
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