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    "cveMetadata": {
        "cveId": "CVE-2026-16729",
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "state": "PUBLISHED",
        "assignerShortName": "openjs",
        "dateReserved": "2026-07-23T05:44:24.720Z",
        "datePublished": "2026-07-29T16:45:57.001Z",
        "dateUpdated": "2026-07-29T18:08:16.149Z"
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                "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
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            "descriptions": [
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                    "lang": "en",
                    "value": "undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0."
                        }
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                }
            ],
            "affected": [
                {
                    "vendor": "undici",
                    "product": "undici",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "6.28.0"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "6.28.0"
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                            "versionType": "semver",
                            "status": "affected",
                            "version": "7.0.0",
                            "lessThan": "7.29.0"
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                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "7.29.0"
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                            "status": "unaffected",
                            "version": "8.9.0"
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                    "packageURL": "pkg:npm/undici"
                }
            ],
            "references": [
                {
                    "url": "https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm"
                },
                {
                    "url": "https://cna.openjsf.org/security-advisories.html"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Zelys-DFKH"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "mcollina"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "UlisesGascon"
                }
            ],
            "title": "undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields",
            "metrics": [
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                    "format": "CVSS",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                        "baseScore": 4.8,
                        "baseSeverity": "MEDIUM"
                    },
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                            "lang": "en",
                            "value": "GENERAL"
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            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-74",
                            "lang": "en",
                            "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')",
                            "type": "CWE"
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                            "content": {
                                "timestamp": "2026-07-29T18:08:05.310961Z",
                                "id": "CVE-2026-16729",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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