{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-40561",
        "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "state": "PUBLISHED",
        "assignerShortName": "CPANSec",
        "dateReserved": "2026-04-14T11:35:53.644Z",
        "datePublished": "2026-05-03T00:57:31.519Z",
        "dateUpdated": "2026-05-07T16:45:01.655Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "packageName": "Starlet",
                    "product": "Starlet",
                    "programFiles": [
                        "lib/Starlet/Server.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "Starlet::Server::handle_connection"
                        }
                    ],
                    "repo": "https://github.com/kazuho/Starlet",
                    "vendor": "KAZUHO",
                    "versions": [
                        {
                            "lessThanOrEqual": "0.31",
                            "status": "affected",
                            "version": "0",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "CPANSec"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nStarlet incorrectly prioritizes \"Content-Length\" over \"Transfer-Encoding: chunked\" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-33",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-33 HTTP Request Smuggling"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-444",
                            "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
                "shortName": "CPANSec",
                "dateUpdated": "2026-05-07T16:45:01.655Z"
            },
            "references": [
                {
                    "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch"
                },
                {
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://metacpan.org/release/KAZUHO/Starlet-0.32/changes"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to Starlet 0.32 or later."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "timeline": [
                {
                    "lang": "en",
                    "time": "2019-11-19T00:00:00.000Z",
                    "value": "Patch submitted to Starlet 0.31"
                },
                {
                    "lang": "en",
                    "time": "2026-04-12T00:00:00.000Z",
                    "value": "Issue identified by CPANSec"
                },
                {
                    "lang": "en",
                    "time": "2026-04-28T00:00:00.000Z",
                    "value": "Maintainer notified"
                },
                {
                    "lang": "en",
                    "time": "2026-05-02T00:00:00.000Z",
                    "value": "Determined that the issue was already public on GitHub"
                },
                {
                    "lang": "en",
                    "time": "2026-05-06T00:00:00.000Z",
                    "value": "Starlet 0.32 released with a fix"
                }
            ],
            "title": "Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence",
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Migrate to Starman 0.4018 or later which has fixed this issue or apply the patch."
                }
            ],
            "x_generator": {
                "engine": "cpansec-cna-tool 0.1"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/05/03/1"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-05-03T03:04:55.098Z"
                }
            },
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 5.3,
                            "attackVector": "NETWORK",
                            "baseSeverity": "MEDIUM",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                            "integrityImpact": "LOW",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-04T13:54:42.679845Z",
                                "id": "CVE-2026-40561",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "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": "2026-05-04T13:54:47.941Z"
                }
            }
        ]
    }
}