Medium [CVE-2026-79775] Denial of Service via malicious SquashFS image parsing
This medium-severity Red Hat Linux advisory covers CVE-2026-79775 affecting Assisted Installer for Red Hat OpenShift Container Platform 2, Cryostat 4, Exploit Intelligence.
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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 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.
A flaw was found in 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.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-369.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- 72.0
- 74.4
- 75.0
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 72.0, 74.4, 75.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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