CVE-2026-8469— Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook

Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook

Allocation of Resources Without Limits or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion. Multiple LiveView event handlers convert user-supplied event parameter strings to atoms using String.to_atom/1 without validation: 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3 interns every key of the psb-assign params map; 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3 interns the "attr" value from psb-toggle events; 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2 interns elements of "variation_id"; and 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4 interns raw string values for attributes declared as :atom or :boolean. BEAM atoms are never garbage-collected, so each unique attacker-controlled string is a permanent allocation. Once the atom table ceiling (~1,048,576 atoms) is reached, the entire BEAM node aborts, taking down all applications running on it. This issue affects phoenix_storybook from 0.2.0 before 1.1.0.

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不加限制或调节的资源分配

PhoenixStorybook 安全漏洞

PhoenixStorybook是Phenix Digital开源的一个组件展示与交互调试的UI工具。 PhoenixStorybook 0.2.0版本至1.1.0之前版本存在安全漏洞，该漏洞源于未验证地将用户提供的参数字符串转换为原子，可能导致BEAM原子表耗尽，造成拒绝服务。

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