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    <lastBuildDate>Thu, 15 Oct 2026 18:24:33 +0000</lastBuildDate>
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      <title>CVE-2026-106448 — StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-106448</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; stablelib&lt;/p&gt;
&lt;p&gt;StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object&amp;#39;s prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; stablelib&lt;/p&gt;
&lt;p&gt;StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object&amp;#39;s prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.&lt;/p&gt;</content:encoded>
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