CVE-2026-63447

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Source
https://cve.org/CVERecord?id=CVE-2026-63447
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-63447.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-63447
Aliases
  • GHSA-w394-3g33-3jg9
Downstream
Published
2026-09-18T20:21:06Z
Modified
2026-09-20T08:19:46Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-407"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63447.json"
}
References

Affected packages

Git / github.com/oisf/suricata

Affected ranges

Type
GIT
Repo
https://github.com/oisf/suricata
Events
Introduced
5611b60c6172fe4204cd69a9c9d466b6632dd0c7
Fixed
15bf91c5ccbbbf640cd042e1c96974b262549385
Fixed
82c41905589305e8389ceb793907ccb74798aee5
Fixed
4c28cc1b4ac64f48efdca6ce3e09748227a04a7e
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "8.0.5"
        },
        {
            "fixed":  "8.0.6"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

suricata-8.*
suricata-8.0.5

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-63447.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "306855349619449465758699199046490832071",
                "75407180318704451699303769443305508093",
                "39303598362479424149007240627516032807",
                "321312278509817080328828955784440999996"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-63447-3bcd46b4",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/oisf/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5",
        "target":  {
            "file":  "src/app-layer-ftp.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "54869343555753753862894792284885225952",
            "length":  749
        },
        "id":  "CVE-2026-63447-6078afbe",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/oisf/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5",
        "target":  {
            "file":  "src/app-layer-ftp.c",
            "function":  "FTPTransactionCreate"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "306855349619449465758699199046490832071",
                "75407180318704451699303769443305508093",
                "39303598362479424149007240627516032807",
                "321312278509817080328828955784440999996"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-63447-d253277e",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/oisf/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385",
        "target":  {
            "file":  "src/app-layer-ftp.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "54869343555753753862894792284885225952",
            "length":  749
        },
        "id":  "CVE-2026-63447-d52b147d",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/oisf/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385",
        "target":  {
            "file":  "src/app-layer-ftp.c",
            "function":  "FTPTransactionCreate"
        }
    }
]
vanir_signatures_modified 
"2026-09-20T08:19:46Z"