Sinatra has ReDoS vulnerability in ETag header value generation_CVE-2025-61921

{
    "lastseen": "",
    "description": "Sinatra is a domain-specific language for creating web applications in Ruby. In versions prior to 4.2.0, there is a denial of service vulnerability in the `If-Match` and `If-None-Match` header parsing component of Sinatra, if the `etag` method is used when constructing the response. Carefully crafted input can cause `If-Match` and `If-None-Match` header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the `ETag` header value. Any applications that use the `etag` method when generating a response are impacted. Version 4.2.0 fixes the issue.",
    "published": "2025-10-10T19:28:10.688Z",
    "modified": "2025-10-10T19:28:10.688Z",
    "type": "cve",
    "title": "Sinatra has ReDoS vulnerability in ETag header value generation",
    "source": "GitHub_M",
    "references": "https://github.com/sinatra/sinatra/security/advisories/GHSA-mr3q-g2mv-mr4q\nhttps://github.com/sinatra/sinatra/issues/2120\nhttps://github.com/sinatra/sinatra/pull/1823\nhttps://github.com/sinatra/sinatra/pull/2121\nhttps://bugs.ruby-lang.org/issues/19104",
    "id": "CVE-2025-61921",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1333"
    ],
    "cvelist": null,
    "sourceData": "sinatra sinatra < 4.2.0",
    "sourceHref": "",
    "cvss": {
        "score": 2.7,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
        "version": "4.0"
    },
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "sinatra",
    "version": "< 4.2.0",
    "vendor": "sinatra",
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}