{"id":279,"date":"2026-10-29T07:39:26","date_gmt":"2026-10-29T07:39:26","guid":{"rendered":"https:\/\/bugskan.com\/?p=279"},"modified":"2026-10-29T07:39:27","modified_gmt":"2026-10-29T07:39:27","slug":"litellm-nested-user_config-parameter-could-bypass-outbound-destination-checks","status":"publish","type":"post","link":"https:\/\/bugskan.com\/index.php\/2026\/10\/29\/litellm-nested-user_config-parameter-could-bypass-outbound-destination-checks\/","title":{"rendered":"LiteLLM nested user_config parameter could bypass outbound destination checks"},"content":{"rendered":"<p>LiteLLM\u2019s advisory describes server-side request forgery through a nested user_config parameter. A caller could place a destination override inside that object, bypassing validation that checked only the corresponding top-level fields.<\/p>\n<p>Exploitation required a valid virtual key. The proxy could then make requests to internal or external hosts chosen by the caller, potentially reaching services the caller could not access directly.<\/p>\n<p>The advisory lists releases through 1.83.8 as affected and 1.83.9 as patched. Update to a maintained release and review outbound destination controls. This is a LiteLLM request-validation issue, not a security incident in Claude merely because the proxy supports Anthropic models.<\/p>\n<p><a href=\"https:\/\/github.com\/advisories\/GHSA-hx8v-g79f-8w5f\">Read the original source<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE-2026-59823 required a valid virtual key and was fixed in version 1.83.9.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"bugskan_incident_id":"inc_62f4821b6c9b69","bugskan_event_type":"vulnerability","bugskan_response":"REVIEW","bugskan_technical_severity":"","bugskan_technical_severity_source":"","bugskan_evidence_quality":"high","bugskan_affected_scope":"LiteLLM Proxy &lt;=1.83.8 under the conditions described in the advisory.","bugskan_recommended_next_step":"Update LiteLLM and review nested request routing parameters and outbound access.","bugskan_who_should_check":"","bugskan_material_updated_at":"2026-09-17T00:00:00Z","bugskan_reviewer_name":"","bugskan_reviewed_at":"","bugskan_legacy_state":"mapped","bugskan_featured":false,"bugskan_sample":false,"footnotes":""},"categories":[1],"tags":[],"bugskan_format":[2],"bugskan_technology":[21],"class_list":["post-279","post","type-post","status-publish","format-standard","hentry","category-uncategorized","bugskan_format-security-brief","bugskan_technology-litellm"],"_links":{"self":[{"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/posts\/279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/comments?post=279"}],"version-history":[{"count":1,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/posts\/279\/revisions"}],"predecessor-version":[{"id":420,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/posts\/279\/revisions\/420"}],"wp:attachment":[{"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/media?parent=279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/categories?post=279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/tags?post=279"},{"taxonomy":"bugskan_format","embeddable":true,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/bugskan_format?post=279"},{"taxonomy":"bugskan_technology","embeddable":true,"href":"https:\/\/bugskan.com\/index.php\/wp-json\/wp\/v2\/bugskan_technology?post=279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}