{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-86409",
        "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "state": "PUBLISHED",
        "assignerShortName": "curl",
        "dateReserved": "2026-09-07T12:11:44.926Z",
        "datePublished": "2026-10-20T19:57:01.794Z",
        "dateUpdated": "2026-10-20T19:57:01.794Z"
    },
    "containers": {
        "cna": {
            "title": "stale SigV4 headers sent unintended",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication,\ncontrary to expectations and documentation. A subsequent transfer on the same\nhandle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL\nisset next, leaking state information."
                }
            ],
            "providerMetadata": {
                "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
                "shortName": "curl",
                "dateUpdated": "2026-10-20T19:57:01.794Z"
            },
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-201 Information Exposure Through Sent Data"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "curl",
                    "product": "curl",
                    "versions": [
                        {
                            "version": "8.21.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.21.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.20.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.20.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.19.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.19.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.18.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.18.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.17.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.17.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.16.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.16.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.15.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.15.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.14.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.14.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.14.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.14.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.13.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.13.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.12.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.12.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.12.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.12.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.11.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.11.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.11.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.11.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.10.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.10.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.10.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.10.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.9.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.9.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.9.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.9.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.8.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.8.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.7.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.7.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.7.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.7.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.6.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.6.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.5.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.5.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.4.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.4.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.3.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.3.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.2.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.2.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.2.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.2.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.1.2",
                            "status": "affected",
                            "lessThanOrEqual": "8.1.2",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.1.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.1.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.1.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.1.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.0.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.0.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.0.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.0.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.88.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.88.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.88.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.88.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.87.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.87.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.86.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.86.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.85.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.85.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.84.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.84.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.83.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.83.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.83.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.83.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.82.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.82.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.81.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.81.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.80.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.80.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.79.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.79.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.79.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.79.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.78.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.78.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.77.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.77.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.76.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.76.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.76.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.76.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.75.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.75.0",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "references": [
                {
                    "url": "https://curl.se/docs/CVE-2026-86409.json",
                    "name": "json"
                },
                {
                    "url": "https://curl.se/docs/CVE-2026-86409.html",
                    "name": "www"
                },
                {
                    "url": "https://hackerone.com/reports/3973135",
                    "name": "issue"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Stanislav Fort (Aisle Research)",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Viktor Szakats",
                    "type": "remediation developer"
                }
            ]
        }
    }
}