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    <lastBuildDate>Fri, 02 Oct 2026 01:20:20 +0000</lastBuildDate>
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      <title>CVE-2026-28490 — Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-28490</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; authlib&lt;/p&gt;
&lt;p&gt;Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; authlib&lt;/p&gt;
&lt;p&gt;Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.&lt;/p&gt;</content:encoded>
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