CVE-2026-79775
Description
A flaw was found in rclone. The archive backend's SquashFS parser fails to validate attacker-controlled superblock and metadata values before use. An attacker who can place or modify a malicious SquashFS image in storage exposed through an rclone :archive: remote can trigger multiple denial-of-service vulnerabilities. This can lead to an integer division-by-zero panic, an out-of-bounds slice panic, or a non-progress CPU loop, which can terminate the rclone process, potentially crash an SFTP server, or cause sustained CPU consumption.
Statement
A flaw was found in the go-diskfs library used by rclone. The SquashFS image parser is vulnerable to denial of service when processing a maliciously crafted SquashFS image. A divide-by-zero error occurs during parsing, causing the application to panic and crash. An attacker who can supply a crafted SquashFS image to an application using go-diskfs for parsing can trigger the crash.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
A Divide by Zero results in a crash.
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