CVE-2026-63447

HIGHPre-NVD 7.57.5
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk of FTP command data. The oversized transaction list is repeatedly processed with quadratic complexity after the too_many_transactions event, allowing crafted FTP traffic to degrade packet processing, reduce monitoring visibility, or cause denial of service. This issue is fixed in version 8.0.6.

CVSS v3
7.5
EG Score
7.5(low)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Sep 18, 2026
Patch available. Sources: github_release, github, github_commit.
generic

Open Information Security Foundation

https://redmine.openinfosecfoundation.org/issues/8592
github_release Patch Available

8.0.6

Patch available: OISF/suricata suricata-8.0.6

https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
github_commit

commit 82c419055893 (OISF/suricata)

Fix landed in OISF/suricata commit 82c419055893 — awaiting tagged release

https://github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5
github_commit Patch Available

commit 15bf91c5ccbb (OISF/suricata)

Patch available: OISF/suricata suricata-8.0.6 (contains commit 15bf91c5ccbb)

https://github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385
github Patch Available

ftp: crafted FTP traffic can cause quadratic CPU consumption · Advisory · OISF/suricata · GitHub

https://github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 3× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 21:17 UTCEG score recompute
  2. 2026-09-18 20:25 UTCEG score recompute
  3. 2026-09-18 20:24 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-63447?
CVE-2026-63447 is a high vulnerability published on September 18, 2026. Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk…
When was CVE-2026-63447 disclosed?
CVE-2026-63447 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-63447?
CVE-2026-63447 has a CVSS v3 base score of 7.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-63447?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63447, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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