{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-33691",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-03-23T16:34:59.932Z",
        "datePublished": "2026-04-02T15:03:52.126Z",
        "dateUpdated": "2026-04-18T19:16:54.006Z"
    },
    "containers": {
        "cna": {
            "title": "OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-178",
                            "lang": "en",
                            "description": "CWE-178: Improper Handling of Case Sensitivity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 6.8,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "CHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w"
                },
                {
                    "name": "https://github.com/coreruleset/coreruleset/pull/4546",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/pull/4546"
                },
                {
                    "name": "https://github.com/coreruleset/coreruleset/pull/4547",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/pull/4547"
                },
                {
                    "name": "https://github.com/coreruleset/coreruleset/pull/4548",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/pull/4548"
                },
                {
                    "name": "https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02"
                },
                {
                    "name": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9"
                },
                {
                    "name": "https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0"
                }
            ],
            "affected": [
                {
                    "vendor": "coreruleset",
                    "product": "coreruleset",
                    "versions": [
                        {
                            "version": "< 3.3.9",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.0.0-rc1, < 4.25.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-04-02T15:03:52.126Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0."
                }
            ],
            "source": {
                "advisory": "GHSA-rw5f-9w43-gv2w",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/03/29/2"
                    },
                    {
                        "url": "http://seclists.org/fulldisclosure/2026/Apr/0"
                    },
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/04/18/4"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-04-18T19:16:54.006Z"
                }
            },
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-04-02T17:38:01.007742Z",
                                "id": "CVE-2026-33691",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-04-02T17:38:10.247Z"
                }
            }
        ]
    }
}