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CVE-2026-79781— rclone serve s3 Path Traversal via dot-dot object keys

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 版本之前的 服务中存在一个路径遍历漏洞。攻击者可以通过在 S3 对象键（object key）中使用“../”等双点段，读取并覆盖位于根目录下的文件。例如，攻击者可以发送包含类似 的对象键的请求，从而绕过存储桶命名空间的限制，访问并操作 serve 根目录下的敏感文件。

CVSS 6.5 · Medium

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-2026-79781

Vulnerability Information
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Vulnerability Title
rclone serve s3 Path Traversal via dot-dot object keys
Source: CVE Program / CVE List V5
Vulnerability Description
rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to read and overwrite root-level files by using dot-dot segments in S3 object keys. Attackers can send requests with object keys like ../root-secret.txt to escape the bucket namespace and access files in the serve root directory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
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-2026-79781

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III. Intelligence Information for CVE-2026-79781

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Vendor Advisories for CVE-2026-79781 (2)

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

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-2026-79783 3.6 LOW rclone before 1.74.4 Privilege Escalation via setuid Metadata
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-22

V. Comments for CVE-2026-79781

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