CVE-2026-79781Public exploitNetwork attack vector

Unauthorized file reads and overwrites via dot-dot keys

Published Aug 25, 2026 · Updated Aug 25, 2026

Path traversal in rclone serve s3 before 1.74.4 allows remote attackers to read and overwrite files within the configured serve root. The S3 backend passes the bucket name and attacker-controlled object key to path.Join, which normalizes dot-dot segments and escapes the selected bucket namespace. The server permits anonymous requests when no authentication key is configured; traversal remains confined to the configured serve root and does not reach files outside it.

CVSS severity6.9
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in rclone serve s3 before 1.74.4 allows remote attackers to read and overwrite files within the configured serve root. The S3 backend passes the bucket name and attacker-controlled object key to path.Join, which normalizes dot-dot segments and escapes the selected bucket namespace. The server permits anonymous requests when no authentication key is configured; traversal remains confined to the configured serve root and does not reach files outside it.

The record

CVE
CVE-2026-79781
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Rclone
Product
rclone
Classifications
CWE-22, T1565.001, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.74.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rclone · rcloneversion=0 <1.74.4

Published CVSS scores

6.5VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1565.001Stored Data Manipulation
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo