CVE-2026-63446

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

Published: Sep 18, 2026Updated: Sep 23, 2026 Sources: CVE List NVDCWE-401

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-401 CWE-407

Affected Products

OISF

oss-projectaka libhtp, suricata-update, suricata

suricataOn-premNetwork Device

Networking Infrastructure / firewall

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

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

and 3 more references View all →

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