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      <title>CVE-2026-42040 — Axios: Null Byte Injection via Reverse-Encoding in AxiosURLSearchParams</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-42040</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; axios&lt;/p&gt;
&lt;p&gt;Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the encode() function in lib/helpers/AxiosURLSearchParams.js contains a character mapping (charMap) at line 21 that reverses the safe percent-encoding of null bytes. After encodeURIComponent(&amp;#39;\x00&amp;#39;) correctly produces the safe sequence %00, the charMap entry &amp;#39;%00&amp;#39;: &amp;#39;\x00&amp;#39; converts it back to a raw null byte. Primary impact is limited because the standard axios request flow is not affected. This vulnerability is fixed in 1.15.1 and 0.31.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; axios&lt;/p&gt;
&lt;p&gt;Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the encode() function in lib/helpers/AxiosURLSearchParams.js contains a character mapping (charMap) at line 21 that reverses the safe percent-encoding of null bytes. After encodeURIComponent(&amp;#39;\x00&amp;#39;) correctly produces the safe sequence %00, the charMap entry &amp;#39;%00&amp;#39;: &amp;#39;\x00&amp;#39; converts it back to a raw null byte. Primary impact is limited because the standard axios request flow is not affected. This vulnerability is fixed in 1.15.1 and 0.31.1.&lt;/p&gt;</content:encoded>
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