CVE-2026-63446CWE-401CWE-407

CVE-2026-63446

High · published September 19, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
52.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00684 · 52.0th percentile
Weaknesses
CWE-401 · Missing Release of Memory after Effective Lifetime; CWE-407 · Inefficient Algorithmic Complexity
Published
2026-09-19T01:17Z
Affected products (1)
ProductVersionsFixed in
oisf/suricata≥ 8.0.0, < 8.0.68.0.6
References (6)
https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8 · [email protected]https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7 · [email protected]https://github.com/OISF/suricata/pull/15726 · [email protected]https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 · [email protected]https://github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m · [email protected]https://redmine.openinfosecfoundation.org/issues/8628 · [email protected]
EPSS history
Timeline
  • 20 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 18 SEP 20:22Z
    Suricata app-layer: passed flows can retain transactions, causing resource exhaustion
    cvelistv5