{
    "dataType": "CVE_RECORD",
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    "cveMetadata": {
        "cveId": "CVE-2026-19931",
        "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "state": "PUBLISHED",
        "assignerShortName": "curl",
        "dateReserved": "2026-08-15T10:35:02.789Z",
        "datePublished": "2026-09-06T17:47:43.523Z",
        "dateUpdated": "2026-09-15T06:02:51.009Z"
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            },
            "title": "Negotiate ambient user conn reuse",
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                {
                    "lang": "en",
                    "value": "A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given\nhostname using Negotiate authentication, when the initial request is done\nusing empty credentials. This can make user B's request get sent over user A's\npreviously authenticated connection."
                }
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                    "product": "curl",
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                            "status": "affected"
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                {
                    "url": "https://curl.se/docs/CVE-2026-19931.json"
                },
                {
                    "url": "https://curl.se/docs/CVE-2026-19931.html"
                },
                {
                    "url": "https://hackerone.com/reports/3923520"
                }
            ],
            "x_osv": {
                "schema_version": "1.5.0",
                "id": "CURL-CVE-2026-19931",
                "aliases": [
                    "CVE-2026-19931"
                ],
                "summary": "Negotiate ambient user conn reuse",
                "modified": "2026-09-07T10:34:51.00Z",
                "database_specific": {
                    "package": "curl",
                    "affects": "both",
                    "URL": "https://curl.se/docs/CVE-2026-19931.json",
                    "www": "https://curl.se/docs/CVE-2026-19931.html",
                    "issue": "https://hackerone.com/reports/3923520",
                    "CWE": {
                        "id": "CWE-488",
                        "desc": "Exposure of Data Element to Wrong Session"
                    },
                    "last_affected": "8.21.0",
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                },
                "published": "2026-09-02T08:00:00.00Z",
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                "credits": [
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                        "name": "Martin Dukek",
                        "type": "finder"
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            },
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                            "description": "Exposure of Data Element to Wrong Session",
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                            "version": "3.1",
                            "baseScore": 9.8,
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                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
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                                "id": "CVE-2026-19931",
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