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    "cveMetadata": {
        "cveId": "CVE-2026-4867",
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "state": "PUBLISHED",
        "assignerShortName": "openjs",
        "dateReserved": "2026-03-25T20:11:53.714Z",
        "datePublished": "2026-03-26T16:16:25.501Z",
        "dateUpdated": "2026-03-26T16:52:14.893Z"
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            "descriptions": [
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                    "lang": "en",
                    "value": "Impact:\n\nA bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in path-to-regexp@0.1.12 only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking.\n\nPatches:\n\nUpgrade to path-to-regexp@0.1.13\n\nCustom regex patterns in route definitions (e.g., /:a-:b([^-/]+)-:c([^-/]+)) are not affected because they override the default capture group.\n\nWorkarounds:\n\nAll versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]+)-:c([^-/]+).\n\nIf paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length.",
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                            "value": "Impact:\n\nA bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in path-to-regexp@0.1.12 only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking.\n\nPatches:\n\nUpgrade to path-to-regexp@0.1.13\n\nCustom regex patterns in route definitions (e.g., /:a-:b([^-/]+)-:c([^-/]+)) are not affected because they override the default capture group.\n\nWorkarounds:\n\nAll versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]+)-:c([^-/]+).\n\nIf paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length."
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            "affected": [
                {
                    "vendor": "path-to-regexp",
                    "product": "path-to-regexp",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "0.1.13"
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                    "packageURL": "pkg:npm/path-to-regexp"
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            ],
            "references": [
                {
                    "url": "https://github.com/advisories/GHSA-9wv6-86v2-598j"
                },
                {
                    "url": "https://blakeembrey.com/posts/2024-09-web-redos"
                },
                {
                    "url": "https://cna.openjsf.org/security-advisories.html"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "EthanKim88"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "blakeembrey"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "UlisesGascon"
                }
            ],
            "title": "path-to-regexp vulnerable to Regular Expression Denial of Service via multiple route parameters",
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                    "format": "CVSS",
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                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
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            "problemTypes": [
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                    "descriptions": [
                        {
                            "cweId": "CWE-1333",
                            "lang": "en",
                            "description": "CWE-1333: Inefficient Regular Expression Complexity",
                            "type": "CWE"
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                                "timestamp": "2026-03-26T16:52:08.810671Z",
                                "id": "CVE-2026-4867",
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                                        "Exploitation": "none"
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