Vulnerability in phoenix_storybook (CVE-2026-8469)
Summary
Vulnerability in phoenix_storybook (CVE-2026-8469). Risk of unauthorized operations or information disclosure. Exploitable via PhoenixStorybook.Story.Playground. Mitigation: upgrade to 1.1.0 or later.
Original description
The description as published by the source.
Summary
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.
Configurations
Phoenix Storybook must be mounted on a network-reachable route.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-8469 has been found in phoenix_storybook.
Attackers can target a specific entry point like PhoenixStorybook.Story.Playground over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade phoenix_storybook to 1.1.0 or later.
If unsure, ask your IT team or search "phoenix_storybook CVE-2026-8469" on the vendor's site.
CVE-2026-8469 (phoenix_storybook) — CWE-770
Attack surface: PhoenixStorybook.Story.Playground / PhoenixStorybook.ExtraAssignsHelpers / FakeStory / extra_assigns
Patched: 1.1.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-770) exists in phoenix_storybook. Attackers reach the vulnerable code path via PhoenixStorybook.Story.Playground.
Check the vendor advisory for the affected versions of phoenix_storybook. Attack surface: PhoenixStorybook.Story.Playground / PhoenixStorybook.ExtraAssignsHelpers / FakeStory / extra_assigns.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.1.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'phoenix_storybook' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'phoenix_storybook' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
phoenix_storybookを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade phoenix_storybook to 1.1.0ステージング環境で 1.1.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package hex.pm
- package github.com
- patch github.com
- web cna.erlef.org
- web osv.dev
- web github.com