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    CVE-2026-63446

    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.

    Published:Sep 18, 2026
    Last Modified:Sep 28, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00684
    CVSS Score:7.5

    Affected Products

    Vendor
    Oisf
    Product
    Suricata

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-94084 (CVSS 9.4) — Suricata before 8.0.7 has an Http2ThreadMultiBuf use-after-free when a transaction is inspected by rules that …
    CVE-2026-94083 (CVSS 9.4) — Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the H…
    CVE-2026-71855 (CVSS 5.9) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-71418 (CVSS 7.5) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-57223 (CVSS 7) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-63447 (CVSS 7.5) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-63448 (CVSS 5.9) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-57229 (CVSS 5.3) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-57225 (CVSS 3.3) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …
    CVE-2026-63452 (CVSS 7.5) — Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-63446 — Oisf (High 7.5) | CVE-DB