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

Quick assessment

Affected
phenixdigital phoenix_storybook
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P42

Affected Version Matrix 2

VendorProduct Version RangeStatus
phenixdigital phoenix_storybook 0.2.0< 1.1.0 affected
0228669d55c23a754d1ef11f49a32121129d5395< 96d524690af0fe197a49f60d18e564a620b9ef81 affected
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I. Basic Information for CVE-2026-8469

Vulnerability Information
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Vulnerability Title
Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
PhoenixStorybook 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
phenixdigital phoenix_storybook 0.2.0 ~ 1.1.0 cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
phenixdigital phoenix_storybook 0228669d55c23a754d1ef11f49a32121129d5395 ~ 96d524690af0fe197a49f60d18e564a620b9ef81 cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8469

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III. Intelligence Information for CVE-2026-8469

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Patches & Fixes for CVE-2026-8469 (1)

Vendor Advisories for CVE-2026-8469 (3)

Same Patch Batch · phenixdigital · 2026-05-20 · 3 CVEs total

CVE-2026-47068 Cross-session PubSub topic injection via URL parameter in phoenix_storybook
CVE-2026-8467 Unauthenticated remote code execution via HEEx template injection in phoenix_storybook pla

IV. Related Vulnerabilities

Same product: phoenix_storybook
Same vendor: phenixdigital
Same weakness: CWE-770

V. Comments for CVE-2026-8469

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