# Critical Photon OS Security Update

## Summary
  
Advisory Id     : PHSA-2026-5.0-0909
  
Type            : Security
  
Severity        : ['Critical', 'Important', 'Moderate']
  
Issue date      : 2026-06-29
  
Affected Release: 5.0

## Details
  
Updates of ['rubygem-concurrent-ruby'] packages of Photon OS have been released.
## Affected Packages

### Critical
  
rubygem-concurrent-ruby - ['[CVE-2026-54906](https://nvd.nist.gov/vuln/detail/CVE-2026-54906)']

### Important
  
rubygem-concurrent-ruby - ['[CVE-2026-54904](https://nvd.nist.gov/vuln/detail/CVE-2026-54904)']

### Moderate
  
rubygem-concurrent-ruby - ['[CVE-2026-54905](https://nvd.nist.gov/vuln/detail/CVE-2026-54905)']

## Solution
  
Update the affected packages (tdnf update package)

## Updated Packages Information
  
rubygem-concurrent-ruby-1.3.7-1.ph5.x86_64.rpm | size : 936K , sha256 : a6ffa6be8bb44d4cb001f6331a3af3e2b751e0795949a7b61af0256998e8e29e , build time : Mon, 29 Jun 2026 12:56:19 UTC