CVE-2026-8469

Severity CVSS v4.0:

HIGH

Type:

Unavailable / Other

Publication date:

20/05/2026

Last modified:

21/05/2026

Description

Allocation of Resources Without Limits or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion.<br /> <br /> Multiple LiveView event handlers convert user-supplied event parameter strings to atoms using String.to_atom/1 without validation: &#39;Elixir.PhoenixStorybook.ExtraAssignsHelpers&#39;:handle_set_variation_assign/3 interns every key of the psb-assign params map; &#39;Elixir.PhoenixStorybook.ExtraAssignsHelpers&#39;:handle_toggle_variation_assign/3 interns the "attr" value from psb-toggle events; &#39;Elixir.PhoenixStorybook.ExtraAssignsHelpers&#39;:to_variation_id/2 interns elements of "variation_id"; and &#39;Elixir.PhoenixStorybook.ExtraAssignsHelpers&#39;: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.<br /> <br /> This issue affects phoenix_storybook from 0.2.0 before 1.1.0.

Impact

Vector 4.0

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 CVSS v4.0 Severity and Metrics:

Base Score: 8.20 HIGH
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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): Present
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0

8.20

Severity 4.0

HIGH

CVE-2026-8469

Description

Impact

References to Advisories, Solutions, and Tools