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Security Advisory

USN-6694-1: Expat vulnerabilities

USN-6694-1: Expat vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


It was discovered that Expat could be made to consume large amounts of resources. If a user or automated system were tricked into processing specially crafted input, an attacker could possibly use this issue to cause a denial of service. (CVE-2023-52425, CVE-2024-28757) Update Instructions: Run `sudo pro fix USN-6694-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: expat – 2.4.7-1ubuntu0.3 libexpat1 – 2.4.7-1ubuntu0.3 libexpat1-dev – 2.4.7-1ubuntu0.3 No subscription required

CVEs contained in this USN include: CVE-2023-52425, CVE-2024-28757.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.82.0
  • Jammy Stemcells
    • 1.x versions prior to 1.406
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.406


Users of affected products are strongly encouraged to follow the mitigations below.

The Cloud Foundry project recommends upgrading the following releases:

  • cflinuxfs4
    • Upgrade all versions to 1.82.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.406 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.406 or greater


2024-04-04: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR