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    <lastBuildDate>Wed, 07 Oct 2026 21:39:16 +0000</lastBuildDate>
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      <title>CVE-2026-79658 — Ech0 before 5.0.1 Denial of Service via Accept-Language</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-79658</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; lin-snow Ech0&lt;/p&gt;
&lt;p&gt;Ech0 before 5.0.1 does not impose any size or shape limit on the Accept-Language header processed by its i18n middleware, which runs on every HTTP request. The header is passed unfiltered to go-i18n&amp;#39;s NewLocalizer, which internally calls golang.org/x/text/language.ParseAcceptLanguage. The CVE-2022-32149 mitigation in x/text caps &amp;#39;-&amp;#39; characters but not &amp;#39;_&amp;#39; characters, which the parser aliases to &amp;#39;-&amp;#39;, allowing quadratic-time parsing to be triggered with a large header (up to Go&amp;#39;s default 1 MiB) built from underscore separators. An unauthenticated attacker can send such requests to consume roughly 1.5 seconds of CPU each, and concurrent requests can saturate a multi-core server (denial of service).&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; lin-snow Ech0&lt;/p&gt;
&lt;p&gt;Ech0 before 5.0.1 does not impose any size or shape limit on the Accept-Language header processed by its i18n middleware, which runs on every HTTP request. The header is passed unfiltered to go-i18n&amp;#39;s NewLocalizer, which internally calls golang.org/x/text/language.ParseAcceptLanguage. The CVE-2022-32149 mitigation in x/text caps &amp;#39;-&amp;#39; characters but not &amp;#39;_&amp;#39; characters, which the parser aliases to &amp;#39;-&amp;#39;, allowing quadratic-time parsing to be triggered with a large header (up to Go&amp;#39;s default 1 MiB) built from underscore separators. An unauthenticated attacker can send such requests to consume roughly 1.5 seconds of CPU each, and concurrent requests can saturate a multi-core server (denial of service).&lt;/p&gt;</content:encoded>
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