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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
phenixdigital phoenix_storybook unaffected
Version Status Constraints
0.2.0 affected < 1.1.0
phenixdigital phoenix_storybook unaffected
Version Status Constraints
0228669d55c23a754d1ef11f49a32121129d5395 affected < 96d524690af0fe197a49f60d18e564a620b9ef81

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Project Subscriptions

Vendors Products
Phenixdigital Subscribe
Phoenix Storybook Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cna.erlef.org/cves/CVE-2026-8469.html cve-icon cve-icon
https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81 cve-icon cve-icon
https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q cve-icon cve-icon
https://osv.dev/vulnerability/EEF-CVE-2026-8469 cve-icon cve-icon
History

Wed, 20 May 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook
First Time appeared Phenixdigital
Phenixdigital phoenix Storybook
Weaknesses CWE-770
CPEs cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
Vendors & Products Phenixdigital
Phenixdigital phoenix Storybook
References
Metrics cvssV4_0

{'score': 8.2, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-05-20T13:35:27.914Z

Reserved: 2026-05-13T11:44:43.316Z

Link: CVE-2026-8469

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-05-20T14:17:04.447

Modified: 2026-05-20T14:23:14.993

Link: CVE-2026-8469

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-20T15:30:33Z

Weaknesses