CWE-1333

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        "title": "CISA ADP Vulnrichment"
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          "vendor": "honojs",
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              "version": "\u003c 4.12.34"
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          "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.34, the built-in CORS middleware, hono/cors, is vulnerable to a regular expression denial of service (ReDoS). During a preflight OPTIONS request, the middleware parses the attacker-controlled Access-Control-Request-Headers header using a whitespace-tolerant regular expression whose backtracking makes its running time quadratic in the input length. Because the header value is bounded only by the deployment\u0027s maximum HTTP header size, a single preflight carrying a long run of whitespace can consume seconds of CPU and block request processing. On runtimes that share one execution thread across requests, this stalls concurrent requests as well, and repeated requests can render the service unresponsive. This affects the default configuration, since the vulnerable path is reached whenever cors() is used with an unset or empty allowHeaders. Applications that set a non-empty allowHeaders are not affected. This issue is fixed in version 4.12.34."
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        "advisory": "GHSA-8j4g-w8fx-2239",
        "discovery": "UNKNOWN"
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      "title": "Hono: ReDoS in CORS middleware via Access-Control-Request-Headers"
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              "value": "\u003cp\u003eInefficient Regular Expression Complexity vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to exhaust server CPU via a long CSS declaration in sanitized HTML. The declaration regex in \u003ccode\u003eHtmlSanitizeEx.Scrubber.CSS.scrub/1\u003c/code\u003e matches the property name with an unbounded greedy \u003ccode\u003e[-\\w]+\u003c/code\u003e followed by a mandatory \u003ccode\u003e:\u003c/code\u003e, so a long run of word characters not followed by a colon makes the engine give back one character at a time and retry the colon at every start offset. The work is quadratic in the length of the run, and no length cap is applied to the CSS handed to the scrubber. An 80 KB \u003ccode\u003e\u0026lt;style\u0026gt;\u003c/code\u003e body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive.\u003c/p\u003e\n\u003cp\u003eThe impact is CPU exhaustion only. Nothing is read, modified or disclosed.\u003c/p\u003e\n\u003cp\u003eThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.\u003c/p\u003e"
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              "value": "Inefficient Regular Expression Complexity vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to exhaust server CPU via a long CSS declaration in sanitized HTML. The declaration regex in `HtmlSanitizeEx.Scrubber.CSS.scrub/1` matches the property name with an unbounded greedy `[-\\w]+` followed by a mandatory `:`, so a long run of word characters not followed by a colon makes the engine give back one character at a time and retry the colon at every start offset. The work is quadratic in the length of the run, and no length cap is applied to the CSS handed to the scrubber. An 80 KB `\u003cstyle\u003e` body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive.\n\nThe impact is CPU exhaustion only. Nothing is read, modified or disclosed.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3."
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