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      <title>GHSA-jjhc-v7c2-5hh6 — LiteLLM: Authentication bypass via OIDC userinfo cache key collision</title>
      <link>https://db.gcve.eu/vuln/ghsa-jjhc-v7c2-5hh6</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; PyPI: litellm&lt;/p&gt;
&lt;p&gt;###  Impact&lt;/p&gt;
&lt;p&gt;When JWT authentication is enabled (`enable_jwt_auth: true`), the OIDC userinfo cache uses `token[:20]` as the cache key. JWT headers produced by the same signing algorithm generate identical first 20 characters.&lt;/p&gt;
&lt;p&gt;This configuration option is not enabled by default. **Most instances are not affected.**&lt;/p&gt;
&lt;p&gt;An unauthenticated attacker can craft a token whose first 20 characters match a legitimate user&amp;#39;s cached token. On cache hit, the attacker inherits the legitimate user&amp;#39;s identity and permissions. This affects deployments with JWT/OIDC authentication enabled.&lt;/p&gt;
&lt;p&gt;###  Patches&lt;/p&gt;
&lt;p&gt;Fixed in v1.83.0. The cache key now uses the full hash of the JWT token.&lt;/p&gt;
&lt;p&gt;###  Workarounds&lt;/p&gt;
&lt;p&gt;Disable OIDC userinfo caching by setting the cache TTL to 0, or disable JWT authentication entirely.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; PyPI: litellm&lt;/p&gt;
&lt;p&gt;###  Impact&lt;/p&gt;
&lt;p&gt;When JWT authentication is enabled (`enable_jwt_auth: true`), the OIDC userinfo cache uses `token[:20]` as the cache key. JWT headers produced by the same signing algorithm generate identical first 20 characters.&lt;/p&gt;
&lt;p&gt;This configuration option is not enabled by default. **Most instances are not affected.**&lt;/p&gt;
&lt;p&gt;An unauthenticated attacker can craft a token whose first 20 characters match a legitimate user&amp;#39;s cached token. On cache hit, the attacker inherits the legitimate user&amp;#39;s identity and permissions. This affects deployments with JWT/OIDC authentication enabled.&lt;/p&gt;
&lt;p&gt;###  Patches&lt;/p&gt;
&lt;p&gt;Fixed in v1.83.0. The cache key now uses the full hash of the JWT token.&lt;/p&gt;
&lt;p&gt;###  Workarounds&lt;/p&gt;
&lt;p&gt;Disable OIDC userinfo caching by setting the cache TTL to 0, or disable JWT authentication entirely.&lt;/p&gt;</content:encoded>
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