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CVE-2026-88013— rclone: http backend forwards custom/auth headers to a different host on 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.

rclone 是一个用于在不同云存储提供商之间同步文件和目录的命令行工具。在 1.49.0 至 1.75.1 版本中，HTTP 后端会在 backend/http/http.go 中将通过 --http-headers 或 headers= 配置的请求头附加到请求中，但其使用的 fshttp.NewClient 客户端在跟随重定向时未采用针对特定后端的 http.Client.CheckRedirect 策略。因此，若配置的远程服务器重定向到另一个主机，可能导致如 X-Api-Key 等自定义密钥被重新发送至该不可

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-88013

Vulnerability Information
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Vulnerability Title
rclone: http backend forwards custom/auth headers to a different host on redirect
Source: CVE Program / CVE List V5
Vulnerability Description
rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.49.0 until 1.75.1, the HTTP backend attaches headers configured through --http-headers or headers= to requests in backend/http/http.go, while its fshttp.NewClient client follows redirects without a backend-specific http.Client.CheckRedirect policy. A configured remote that redirects to another host can therefore cause custom secrets such as X-Api-Key to be resent to that untrusted destination, and a same-host HTTPS-to-HTTP redirect can expose Authorization or Cookie headers in cleartext. Listing, stat, download, mount, and serve operations can trigger the leak during normal use. This issue is fixed in version 1.75.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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 >= 1.49.0, < 1.75.1 -

II. Public POCs for CVE-2026-88013

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III. Intelligence Information for CVE-2026-88013

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Patches & Fixes for CVE-2026-88013 (3)

Vendor Advisories for CVE-2026-88013 (1)

Same Patch Batch · rclone · 2026-09-10 · 9 CVEs total

CVE-2026-88018 9.8 CRITICAL rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signatu
CVE-2026-88044 9.1 CRITICAL rclone: RC per-server auth-proxy bypass
CVE-2026-88045 7.5 HIGH rclone: S3 multipart declared-length memory exhaustion
CVE-2026-88017 7.3 HIGH rclone: FTP cross-session auth-proxy backend confusion
CVE-2026-88016 7.1 HIGH rclone: Directory metadata (chmod/chown/chtimes) applied through a planted symlink in rclo
CVE-2026-88014 6.3 MEDIUM rclone archive/zip: Zip Slip via unsanitized zip entry names lets a malicious archive esca
CVE-2026-88015 5.3 MEDIUM rclone local: crafted Range request against a translated symlink panics (DoS)
CVE-2026-88046 5.3 MEDIUM rclone: source object names can escape the configured root on upload

IV. Related Vulnerabilities

Same product: rclone
Same vendor: rclone
Same weakness: CWE-200

V. Comments for CVE-2026-88013

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