CVE-2026-79787
CriticalCVSS 9.8Summary
Alluxio's S3 REST proxy fails to verify AWS Signature Version 4 signatures in its default configuration, allowing unauthenticated attackers to spoof user identity. Attackers can extract usernames from unsigned Authorization headers and impersonate any user, including service accounts, to read, write, and delete arbitrary data.
Risk Assessment
Lack of signature verification enables unauthorized data access, potentially leading to breaches of data confidentiality, integrity, and availability.
Recommendation
Configure Alluxio to require AWS Signature Version 4 signature verification. Restrict access to the S3 proxy and monitor logs for suspicious activity.
Original NVD description (English source)
Alluxio's S3 REST proxy fails to verify AWS Signature Version 4 signatures in its default configuration, allowing unauthenticated attackers to spoof user identity. Attackers can extract usernames from unsigned Authorization headers and impersonate any user, including service accounts, to read, write, and delete arbitrary data.