EUVD-2026-31114CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionNVD
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.
AnalysisAI
Unauthenticated denial-of-service in phenixdigital phoenix_storybook (0.2.0 through versions before 1.1.0) lets a remote attacker crash the entire BEAM virtual machine by exhausting its atom table. Multiple LiveView event handlers in ExtraAssignsHelpers feed user-controlled strings into String.to_atom/1, and because BEAM atoms are never garbage-collected, ~1,048,576 unique attacker-supplied keys/values permanently consume the atom table and abort every application running on that node. …
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RemediationAI
Within 24 hours: Inventory all systems running phenixdigital phoenix_storybook and document versions in use. Within 7 days: For any systems running versions 0.2.0 through 1.0.x, implement network-level restrictions to LiveView event handlers (restrict to trusted sources only) and deploy input validation to prevent user-controlled strings from reaching atom conversion functions. …
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