Open-Source Security Intelligence

Know every vulnerability
before it knows you.

DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.

Check if your repositories are affected!View on GitHub
Search

DRUPAL-CONTRIB-2026-279

Published Oct 28, 2026·Last modified Oct 28, 2026
Affected Components(1)
Packagist:https://packages.drupal.org/8drupal/s3fs
< 3.12.0
Description

S3 File System (s3fs) provides an additional file system to your Drupal site that stores files in Amazon's Simple Storage Service (S3) storage.

The module doesn't sufficiently isolate upload context between separate object(file) operations in the same request resulting in the potential for objects to be uploaded with incorrect access control list (ACL) entries or corruption through incorrect operation metadata.

This vulnerability is mitigated by the fact that an attacker must be able to trigger multiple file operations on S3FS.

Some vectors are mitigated by:

  • Not enabling private:// takeover ($settings['s3fs.use_s3_for_private'] = FALSE;) or only enabled with $settings['s3fs.upload_as_private'] = TRUE;
  • The deployment does not utilize hook_s3fs_stream_open_params_alter(), hook_s3fs_upload_params_alter(), hook_s3fs_copy_params_alter(), or hook_s3fs_command_params_alter()

If both points above have always been true, all currently known vectors are mitigated.

Upload your SBOM

Upload your own SBOM in CycloneDX 1.6 or higher (JSON) directly here to check your vulnerabilities.

Risk Scores
Base Score
-1.0

Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.

Threat Intelligence
-1.0

No exploitation activity has been observed at this time. Continue routine monitoring.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-118574
    Alias
  • EUVD-2026-113692
    Alias
Scan your project

Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.

Checkout DevGuard