Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck
CVE-2026-79781rclone serve s3 Path Traversal via dot-dot object keys
Medium 6.5
In plain English
A medium-severity path traversal in rclone from rclone. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 76.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rclone | no fix listed | DEBIAN-CVE-2026-79781 |
| Debian:13 | rclone | no fix listed | DEBIAN-CVE-2026-79781 |
| Go | github.com/rclone/rclone | 1.74.4 | GHSA-8v25-v8p6-qf7v |
| Go | github.com/rclone/rclone | 1.74.4 | GO-2026-6189 |
| Ubuntu:26.10 | rclone | no fix listed | UBUNTU-CVE-2026-79781 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-8v25-v8p6-qf7v) vendor-advisory
- VulnCheck Advisory: rclone serve s3 Path Traversal via dot-dot object keys third-party-advisory