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CVE-2026-79780— rclone before v1.75.0 Credential Exposure via S3 Redirect

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 v1.75.0 之前的版本中，在处理 S3 重定向回调时，未能对 IBM IAM 承载令牌（bearer tokens）和 SSE-C（服务器端加密密钥客户提供的密钥）加密密钥进行清理。这导致在协议（scheme）或主机（host）变更时，这些凭据可能被保留下来。攻击者若能够监听从受信任端点发出的网络流量，便可在 HTTPS 降级为 HTTP 的同主机攻击中捕获可重用的 IBM IAM 令牌，或在跨源重定向中捕获 SSE-C 密钥，从而访问受保护的 S3 对象。

CVSS 5.3 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
rclone rclone < 1.75.0 affected
1.75.0 unaffected
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I. Basic Information for CVE-2026-79780

Vulnerability Information
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Vulnerability Title
rclone before v1.75.0 Credential Exposure via S3 Redirect
Source: CVE Program / CVE List V5
Vulnerability Description
rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone 0 ~ 1.75.0 -

II. Public POCs for CVE-2026-79780

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III. Intelligence Information for CVE-2026-79780

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Vendor Advisories for CVE-2026-79780 (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-2026-79779 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-200

V. Comments for CVE-2026-79780

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