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Vulnerabilities

Vulnerability · CVE-2026-118574

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

Published Oct 28, 2026 · catalog updated Oct 28, 2026 · S3 File System (s3fs)

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-118574. EPSS is 0.15%. Act only if a listed version of S3 File System (s3fs) is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (S3 File System (s3fs)).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Not established
Affected products
Packagist:https://packages.drupal.org/8 drupal/s3fs

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 ( ) or only enabled with * The deployment does not utilize , , , or If both points above have always been true, all currently known vectors are mitigated.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Packagist:https://packages.drupal.org/8 drupal/s3fs0 → 3.12.0

How to fix CVE-2026-118574

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-118574. EPSS is 0.15%. Act only if a listed version of S3 File System (s3fs) is installed.

Which versions are affected?

Compare what you have installed with 0 → 3.12.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Drupal security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 28, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    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 opera

  2. Oct 28, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    drupal/s3fs fixed in 3.12.0

  3. Oct 28, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    drupal/s3fs fixed in 3.12.0

  4. Oct 28, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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 opera

Sources

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 7, 2026
  • BSI CERT-BundOct 30, 2026
  • OpenSSF OSV / OSV ScannerOct 30, 2026
  • CVE.orgOct 29, 2026