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CVE-2026-79787— Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature

Quick assessment

Affected
Alluxio alluxio
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Alluxio 的 S3 REST 代理服务在其默认配置下未能验证 AWS Signature Version 4（签名版本 4）的签名，这使得未经身份验证的攻击者可以伪装用户身份。攻击者可以从未签名的 Authorization 头部中提取用户名，并冒充任何用户（包括服务账户），从而读取、写入和删除任意数据。

CVSS 9.8 · Critical EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
Alluxio alluxio ≤ 2.9.5 affected
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I. Basic Information for CVE-2026-79787

Vulnerability Information
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Vulnerability Title
Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Alluxio alluxio 0 ~ 2.9.5 -

II. Public POCs for CVE-2026-79787

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8967 chars
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III. Intelligence Information for CVE-2026-79787

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Patches & Fixes for CVE-2026-79787 (1)

Vendor Advisories for CVE-2026-79787 (1)

Other References for CVE-2026-79787 (2)

IV. Related Vulnerabilities

Same weakness: CWE-287

V. Comments for CVE-2026-79787

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