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CVE-2026-79775— rclone Archive Backend SquashFS Parser Denial of Service

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Rclone团队开源的一款命令行云存储文件同步工具。 Rclone 1.72.0版本至1.74.4版本存在输入验证错误漏洞，该漏洞源于SquashFS解析器未验证攻击者控制的superblock和metadata值，可能导致拒绝服务攻击。

CVSS 6.5 · Medium EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
rclone rclone 1.72.0≤ 1.74.4 affected
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I. Basic Information for CVE-2026-79775

Vulnerability Information
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Vulnerability Title
rclone Archive Backend SquashFS Parser Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Rclone 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rclone是Rclone团队开源的一款命令行云存储文件同步工具。 Rclone 1.72.0版本至1.74.4版本存在输入验证错误漏洞，该漏洞源于SquashFS解析器未验证攻击者控制的superblock和metadata值，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone 1.72.0 ~ 1.74.4 -

II. Public POCs for CVE-2026-79775

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III. Intelligence Information for CVE-2026-79775

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Vendor Advisories for CVE-2026-79775 (2)

Same Patch Batch · rclone · 2026-08-25 · 9 CVEs total

CVE-2026-79781 6.5 MEDIUM rclone serve s3 Path Traversal via dot-dot object keys
CVE-2026-79780 5.3 MEDIUM rclone before v1.75.0 Credential Exposure via S3 Redirect
CVE-2026-79779 5.3 MEDIUM rclone before v1.75.0 WebDAV Credential Exposure via HTTPS-to-HTTP Redirect
CVE-2026-79778 5.3 MEDIUM rclone before v1.75.0 Denial of Service via TUS nil-response panic
CVE-2026-79776 5.3 MEDIUM rclone before 1.75.0 Authentication Bypass via pprof
CVE-2026-79783 3.6 LOW rclone before 1.74.4 Privilege Escalation via setuid Metadata
CVE-2026-79782 3.1 LOW rclone before 1.74.4 Security Token Disclosure via HTTPS to HTTP Redirect
CVE-2026-79777 2.7 LOW rclone before v1.75.0 Information Disclosure via RC API

IV. Related Vulnerabilities

Same product: rclone
Same vendor: rclone
Same weakness: CWE-129

V. Comments for CVE-2026-79775

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