# Critical Photon OS Security Update

## Summary
  
Advisory Id     : PHSA-2026-4.0-1046
  
Type            : Security
  
Severity        : ['Critical']
  
Issue date      : 2026-06-29
  
Affected Release: 4.0

## 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)']

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

## Updated Packages Information
  
rubygem-concurrent-ruby-1.1.7-2.ph4.x86_64.rpm | size : 956K , sha256 : 181584781d42ab26d812573618d7e8bb46dbe203b21d71d34b7750686e76f075 , build time : Mon, 29 Jun 2026 09:51:12 UTC