CVE-2026-8469Public exploitNetwork attack vector

Unauthenticated node crash via BEAM atom exhaustion

Published May 20, 2026 · Updated May 20, 2026

Resource exhaustion in Phenix Technologies PhoenixStorybook before 1.1.0 allows remote attackers to crash the hosting BEAM node. Multiple LiveView handlers pass untrusted event keys, variation identifiers, and typed attribute values to String.to_atom/1, permanently interning each unique string. Exploitation requires a network-reachable mounted Storybook route; atom-table exhaustion aborts the entire node and interrupts every hosted application.

CVSS severity8.2
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Resource exhaustion in Phenix Technologies PhoenixStorybook before 1.1.0 allows remote attackers to crash the hosting BEAM node. Multiple LiveView handlers pass untrusted event keys, variation identifiers, and typed attribute values to String.to_atom/1, permanently interning each unique string. Exploitation requires a network-reachable mounted Storybook route; atom-table exhaustion aborts the entire node and interrupts every hosted application.

The record

CVE
CVE-2026-8469
Published
May 20, 2026
Updated
May 20, 2026
Vendor
Phenix Technologies
Product
PhoenixStorybook
Classifications
CWE-770, CAPEC-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2026CVE publishedPublication date reported by the CVE source.
  2. May 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.2.0 <1.1.0
  2. Affected versionversion=0228669d55c23a754d1ef11f49a32121129d5395 <96d524690af0fe197a49f60d18e564a620b9ef81

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Phenix Technologies · PhoenixStorybookversion=0.2.0 <1.1.0; version=0228669d55c23a754d1ef11f49a32121129d5395 <96d524690af0fe197a49f60d18e564a620b9ef81

Published CVSS scores

8.2Erlang Ecosystem FoundationCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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