CVE-2026-79787
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductAlluxio
PublishedAug 25, 2026
First seenAug 25, 2026
Weakness typeCWE-287Improper authentication
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Alluxio alluxio | v ≤ 2.9.5 | — |
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