{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "lang": "en",
        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-30837",
        "tracking": {
            "current_release_date": "2026-03-22T16:25:10.377860Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-30837",
            "initial_release_date": "2026-03-10T21:29:36.417597Z",
            "revision_history": [
                {
                    "date": "2026-03-10T21:29:36.417597Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-10T21:29:44.667332Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-10T21:39:50.374136Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-10T21:39:53.035320Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-10T21:59:21.480456Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)."
                },
                {
                    "date": "2026-03-10T21:59:25.248812Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-11T00:04:08.786911Z",
                    "number": "7",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-03-11T14:55:14.029875Z",
                    "number": "8",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-11T14:55:16.673324Z",
                    "number": "9",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-11T16:39:46.446302Z",
                    "number": "10",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-03-11T16:39:55.084276Z",
                    "number": "11",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-11T23:52:22.825057Z",
                    "number": "12",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-19T15:29:48.295839Z",
                    "number": "13",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)."
                },
                {
                    "date": "2026-03-19T15:29:50.864026Z",
                    "number": "14",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T09:33:55.357895Z",
                    "number": "15",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-20T18:33:46.125946Z",
                    "number": "16",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Identifiers created (1).| Exploits created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-20T18:33:49.944284Z",
                    "number": "17",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "17"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<1.4.26",
                                "product": {
                                    "name": "vers:unknown/<1.4.26",
                                    "product_id": "CSAFPID-5778733",
                                    "product_identification_helper": {
                                        "cpe": "cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:*"
                                    }
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/>=0|<1.4.26",
                                "product": {
                                    "name": "vers:unknown/>=0|<1.4.26",
                                    "product_id": "CSAFPID-5804407"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "elysia"
                    }
                ],
                "category": "vendor",
                "name": "elysiajs"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-30837",
            "cwe": {
                "id": "CWE-1333",
                "name": "Inefficient Regular Expression Complexity"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Prior to 1.4.26 , t.String({ format: 'url' }) is vulnerable to ReDoS. Repeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly. This vulnerability is fixed in 1.4.26.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-30837"
                },
                {
                    "category": "description",
                    "text": "Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Prior to 1.4.26 , t.String({ format: 'url' }) is vulnerable to ReDoS. Repeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly. This vulnerability is fixed in 1.4.26.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-30837"
                },
                {
                    "category": "description",
                    "text": "### Impact\n`t.String({ format: 'url' })` is vulnerable to redos\n\nRepeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly\n```js\n'http://a'.repeat(n)\n```\n\nHere's a table demonstrating how long it takes to process repeated partial url format\n| `n` repeat | elapsed_ms |\n| --- | --- |\n| 1024 | 33.993 |\n| 2048 | 134.357 |\n| 4096 | 537.608 |\n| 8192 | 2155.842 |\n| 16384 | 8618.457 |\n| 32768 | 34604.139 |\n\n### Patches\nPatched by 1.4.26, please kindly update `elysia` to >= 1.4.26 \n\nHere's how long it takes after the patch\n| `n` repeat | elapsed_ms |\n| --- | --- |\n| 1024 | 0.194 |\n| 2048 | 0.274 |\n| 4096 | 0.455 |\n| 8192 | 0.831 |\n| 16384 | 1.632 |\n| 32768 | 3.052 |\n\n### Workarounds\n1. It's recommended to always limit URL format to a reasonable length\n```ts\nt.String({\n\tformat: 'url',\n\tmaxLength: 288\n})\n```\n\n2. If a long URL format is necessary, to patch this without updating to 1.4.26, add the following code to any part of your codebase\n```js\nimport { FormatRegistry } from '@sinclair/typebox'\n\nFormatRegistry.Delete('url')\nFormatRegistry.Set('url', (value) =>\n\t/^(?:https?|ftp):\\/\\/(?:[^\\s:@]+(?::[^\\s@]*)?@)?(?:(?!(?:10|127)(?:\\.\\d{1,3}){3})(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z0-9\\u{00a1}-\\u{ffff}]+-)*[a-z0-9\\u{00a1}-\\u{ffff}]+)(?:\\.(?:[a-z0-9\\u{00a1}-\\u{ffff}]+-)*[a-z0-9\\u{00a1}-\\u{ffff}]+)*(?:\\.(?:[a-z\\u{00a1}-\\u{ffff}]{2,})))(?::\\d{2,5})?(?:\\/[^\\s]*)?$/iu.test(\n\t\tvalue\n\t)\n)\n```",
                    "title": "github - https://github.com/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "description",
                    "text": "### Impact\n`t.String({ format: 'url' })` is vulnerable to redos\n\nRepeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly\n```js\n'http://a'.repeat(n)\n```\n\nHere's a table demonstrating how long it takes to process repeated partial url format\n| `n` repeat | elapsed_ms |\n| --- | --- |\n| 1024 | 33.993 |\n| 2048 | 134.357 |\n| 4096 | 537.608 |\n| 8192 | 2155.842 |\n| 16384 | 8618.457 |\n| 32768 | 34604.139 |\n\n### Patches\nPatched by 1.4.26, please kindly update `elysia` to >= 1.4.26 \n\nHere's how long it takes after the patch\n| `n` repeat | elapsed_ms |\n| --- | --- |\n| 1024 | 0.194 |\n| 2048 | 0.274 |\n| 4096 | 0.455 |\n| 8192 | 0.831 |\n| 16384 | 1.632 |\n| 32768 | 3.052 |\n\n### Workarounds\n1. It's recommended to always limit URL format to a reasonable length\n```ts\nt.String({\n\tformat: 'url',\n\tmaxLength: 288\n})\n```\n\n2. If a long URL format is necessary, to patch this without updating to 1.4.26, add the following code to any part of your codebase\n```js\nimport { FormatRegistry } from '@sinclair/typebox'\n\nFormatRegistry.Delete('url')\nFormatRegistry.Set('url', (value) =>\n\t/^(?:https?|ftp):\\/\\/(?:[^\\s:@]+(?::[^\\s@]*)?@)?(?:(?!(?:10|127)(?:\\.\\d{1,3}){3})(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z0-9\\u{00a1}-\\u{ffff}]+-)*[a-z0-9\\u{00a1}-\\u{ffff}]+)(?:\\.(?:[a-z0-9\\u{00a1}-\\u{ffff}]+-)*[a-z0-9\\u{00a1}-\\u{ffff}]+)*(?:\\.(?:[a-z\\u{00a1}-\\u{ffff}]{2,})))(?::\\d{2,5})?(?:\\/[^\\s]*)?$/iu.test(\n\t\tvalue\n\t)\n)\n```",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-f45g-68q3-5w8x.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "### Impact\n`t.String({ format: 'url' })` is vulnerable to redos\n\nRepeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly\n```js\n'http://a'.repeat(n)\n```\n\nHere's a table demonstrating how long it takes to process repeated partial url format\n| `n` repeat | elapsed_ms |\n| --- | --- |\n| 1024 | 33.993 |\n| 2048 | 134.357 |\n| 4096 | 537.608 |\n| 8192 | 2155.842 |\n| 16384 | 8618.457 |\n| 32768 | 34604.139 |\n\n### Patches\nPatched by 1.4.26, please kindly update `elysia` to >= 1.4.26 \n\nHere's how long it takes after the patch\n| `n` repeat | elapsed_ms |\n| --- | --- |\n| 1024 | 0.194 |\n| 2048 | 0.274 |\n| 4096 | 0.455 |\n| 8192 | 0.831 |\n| 16384 | 1.632 |\n| 32768 | 3.052 |\n\n### Workarounds\n1. It's recommended to always limit URL format to a reasonable length\n```ts\nt.String({\n\tformat: 'url',\n\tmaxLength: 288\n})\n```\n\n2. If a long URL format is necessary, to patch this without updating to 1.4.26, add the following code to any part of your codebase\n```js\nimport { FormatRegistry } from '@sinclair/typebox'\n\nFormatRegistry.Delete('url')\nFormatRegistry.Set('url', (value) =>\n\t/^(?:https?|ftp):\\/\\/(?:[^\\s:@]+(?::[^\\s@]*)?@)?(?:(?!(?:10|127)(?:\\.\\d{1,3}){3})(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z0-9\\u{00a1}-\\u{ffff}]+-)*[a-z0-9\\u{00a1}-\\u{ffff}]+)(?:\\.(?:[a-z0-9\\u{00a1}-\\u{ffff}]+-)*[a-z0-9\\u{00a1}-\\u{ffff}]+)*(?:\\.(?:[a-z\\u{00a1}-\\u{ffff}]{2,})))(?::\\d{2,5})?(?:\\/[^\\s]*)?$/iu.test(\n\t\tvalue\n\t)\n)\n```",
                    "title": "github - https://api.github.com/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "description",
                    "text": "Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Prior to 1.4.26 , t.String({ format: 'url' }) is vulnerable to ReDoS. Repeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly. This vulnerability is fixed in 1.4.26.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30837"
                },
                {
                    "category": "other",
                    "text": "0.00017",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "3.4",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "Is related to CWE-1333 (Inefficient Regular Expression Complexity), The value of the most recent EPSS score, Exploit code publicly available, There is exploit data available from source Nvd",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5778733",
                    "CSAFPID-5804407"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30837"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30837"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-30837"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/30xxx/CVE-2026-30837.json"
                },
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://github.com/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "external",
                    "summary": "Source raw - github",
                    "url": "https://api.github.com/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-30837"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-f45g-68q3-5w8x.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://api.github.com/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30837"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; osv",
                    "url": "https://github.com/EdamAme-x/elysia-poc-redos"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; osv",
                    "url": "https://github.com/elysiajs/elysia/security/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/advisories/GHSA-f45g-68q3-5w8x"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30837"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "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"
                    },
                    "products": [
                        "CSAFPID-5778733",
                        "CSAFPID-5804407"
                    ]
                }
            ],
            "title": "CVE-2026-30837"
        }
    ]
}