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Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M

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

Low 3.7

In plain English

A low-severity information exposure in rclone from rclone. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.2%top 91.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rcloneno fix listedDEBIAN-CVE-2026-88013
Debian:13rcloneno fix listedDEBIAN-CVE-2026-88013
Gogithub.com/rclone/rclone1.75.1GHSA-486v-q2wf-fp2r
Gogithub.com/rclone/rclone1.75.1GO-2026-6463
Ubuntu:26.10rcloneno fix listedUBUNTU-CVE-2026-88013

Affected products (as reported)

VendorProductVersions
rclone rclone >= 1.49.0, < 1.75.1

Weakness: CWE-200, CWE-319, CWE-522 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References