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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-126085

Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Active Storage makes it simple to upload and reference files in cloud services and attach those files to Active Record objects. Prior to 8.1.4.1 and 8.0.5.2, ActiveStorage::Service::GCSService#url_for_direct_upload does not bind the declared content length into the signed direct-upload URL, and #headers_for_direct_upload returns no length constraint, so the URL authorizes an upload body of any size. A direct-upload client could store a file larger than the byte_size it declared, and the resulting blob keeps the declared size, possibly bypassing application file size validations and quotas. This is the weakness that CVE-2020-8162 fixed in the S3 service. Applications that store files in Google Cloud Storage and accept direct uploads are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

rails rails

  • >= 8.1, < 8.1.4.1affected
  • < 8.0.5.2affected

References