Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature (CVE-2026-79787) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-79787

Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature

Answer in brief

CVE-2026-79787 records a Unknown severity vulnerability in Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature. The current sources do not mark it as known exploited. The current feed maps Alluxio/alluxio (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Alluxio/alluxio (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Alluxio/alluxiogeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Alluxio/alluxio.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.