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Security Advisory

USN-6505-1: nghttp2 vulnerability

USN-6505-1: nghttp2 vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


It was discovered that nghttp2 incorrectly handled request cancellation. A remote attacker could possibly use this issue to cause nghttp2 to consume resources, leading to a denial of service. Update Instructions: Run `sudo pro fix USN-6505-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libnghttp2-14 – 1.40.0-1ubuntu0.2 libnghttp2-doc – 1.40.0-1ubuntu0.2 libnghttp2-dev – 1.40.0-1ubuntu0.2 nghttp2-proxy – 1.40.0-1ubuntu0.2 nghttp2 – 1.40.0-1ubuntu0.2 nghttp2-client – 1.40.0-1ubuntu0.2 nghttp2-server – 1.40.0-1ubuntu0.2 No subscription required

CVEs contained in this USN include: CVE-2023-44487.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.52.0
  • Jammy Stemcells
    • 1.x versions prior to 1.309
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.309


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 1.52.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.309 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.309 or greater


2024-03-18: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR