phenixdigital phoenix_storybook up to 1.0.x attr allocation of resources

Summaryinfo

A vulnerability has been found in phenixdigital phoenix_storybook up to 1.0.x and classified as problematic. This issue affects some unknown processing. This manipulation of the argument attr causes allocation of resources. This vulnerability is registered as CVE-2026-8469. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in phenixdigital phoenix_storybook up to 1.0.x. It has been declared as problematic. Affected by this vulnerability is an unknown part. The manipulation of the argument attr with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

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.

The weakness was published by Peter Ullrich and Jonatan Männchen. The advisory is shared at github.com. This vulnerability is known as CVE-2026-8469 since 05/13/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.1.0 eliminates this vulnerability. Applying the patch 96d524690af0fe197a49f60d18e564a620b9ef81 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31114). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• phenixdigital

Name

• phoenix_storybook

Version

• 1.0

Website

• Product: https://github.com/phenixdigital/phoenix_storybook/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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