---
id: CVE-2026-79775
title: >-
  rclone versions >= v1.72.0 and <= v1.74.4 (fixed in v1.75.0) contain multiple
  denial-of-service vulnerabilities in the archive backend's SquashFS parser,
  which relies on the github.com/diskfs/go-diskfs dependency
summary: >-
  rclone versions >= v1.72.0 and <= v1.74.4 (fixed in v1.75.0) contain multiple
  denial-of-service vulnerabilities in the archive backend's SquashFS parser,
  which relies on the github.com/diskfs/go-diskfs dependency. The parser fails
  to val…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-129
published: '2026-08-25'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:46:19.780'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79775'
references:
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-6jcg-q3wp-x2f4'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/rclone-archive-backend-squashfs-parser-denial-of-service
    label: disclosure@vulncheck.com
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-6jcg-q3wp-x2f4'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00307
epssPercentile: 0.23648
ingestedAt: '2026-08-29T21:42:33.610Z'
---

## Overview

rclone versions >= v1.72.0 and <= v1.74.4 (fixed in v1.75.0) contain multiple denial-of-service vulnerabilities in the archive backend's SquashFS parser, which relies on the github.com/diskfs/go-diskfs dependency. The parser fails to validate attacker-controlled superblock and metadata values before use. An attacker who can place or modify a SquashFS image in storage exposed through an rclone :archive: remote can craft a malicious image that triggers an integer division-by-zero panic (zero block size), an out-of-bounds slice panic (out-of-range inode metadata offset), or a non-progress CPU loop (truncated metadata stream). Variants 1 and 2 terminate the rclone process and, via 'rclone serve sftp', can crash the entire SFTP server; variant 3 causes sustained CPU consumption. Parsing is lazy, so a victim or remote client must address or descend into the malicious archive object to trigger it.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.