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CVE-2026-79783— rclone before 1.74.4 Privilege Escalation via setuid Metadata

Quick assessment

Affected
rclone rclone
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 rclone 1.74.4 版本之前，在使用本地后端（local backend）应用由源提供的模式元数据（mode metadata）时，未能正确屏蔽特殊权限位（special permission bits），攻击者从而可以在其控制的文件上设置 setuid/setgid 位。当从不受信任的远程源进行带有元数据保留的复制操作时，攻击者可以植入一个 setuid 二进制文件；若 rclone 以 root 权限运行，则该文件可导致权限提升至 root；否则，权限可提升至服务账户用户（service accou

CVSS 3.6 · Low

Possible ATT&CK Techniques 1 AI

T1548.002 · Bypass User Account Control

Affected Version Matrix 2

VendorProduct Version RangeStatus
rclone rclone < 1.74.4 affected
1.74.4 unaffected
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I. Basic Information for CVE-2026-79783

Vulnerability Information
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Vulnerability Title
rclone before 1.74.4 Privilege Escalation via setuid Metadata
Source: CVE Program / CVE List V5
Vulnerability Description
rclone before 1.74.4 fails to mask special permission bits when applying source-supplied mode metadata in the local backend, allowing attackers to set setuid/setgid bits on attacker-controlled files. When copying with metadata preservation from an untrusted remote, attackers can plant a setuid binary that escalates privileges to root if rclone runs as root, or to the service account user otherwise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone 0 ~ 1.74.4 -

II. Public POCs for CVE-2026-79783

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III. Intelligence Information for CVE-2026-79783

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Vendor Advisories for CVE-2026-79783 (2)

Same Patch Batch · rclone · 2026-08-25 · 9 CVEs total

CVE-2026-79781 6.5 MEDIUM rclone serve s3 Path Traversal via dot-dot object keys
CVE-2026-79775 6.5 MEDIUM rclone Archive Backend SquashFS Parser Denial of Service
CVE-2026-79780 5.3 MEDIUM rclone before v1.75.0 Credential Exposure via S3 Redirect
CVE-2026-79779 5.3 MEDIUM rclone before v1.75.0 WebDAV Credential Exposure via HTTPS-to-HTTP Redirect
CVE-2026-79778 5.3 MEDIUM rclone before v1.75.0 Denial of Service via TUS nil-response panic
CVE-2026-79776 5.3 MEDIUM rclone before 1.75.0 Authentication Bypass via pprof
CVE-2026-79782 3.1 LOW rclone before 1.74.4 Security Token Disclosure via HTTPS to HTTP Redirect
CVE-2026-79777 2.7 LOW rclone before v1.75.0 Information Disclosure via RC API

IV. Related Vulnerabilities

Same product: rclone
Same vendor: rclone
Same weakness: CWE-732

V. Comments for CVE-2026-79783

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