{"id":"CVE-2026-79775","summary":"rclone Archive Backend SquashFS Parser Denial of Service","details":"rclone versions \u003e= v1.72.0 and \u003c= 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.","aliases":["BIT-rclone-2026-79775","GHSA-6jcg-q3wp-x2f4"],"modified":"2026-10-21T02:59:56.427956251Z","published":"2026-08-25T15:16:06.427Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79775.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-129"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79775.json"},{"type":"ADVISORY","url":"https://github.com/rclone/rclone/security/advisories/GHSA-6jcg-q3wp-x2f4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79775"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/rclone-archive-backend-squashfs-parser-denial-of-service"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rclone/rclone","events":[{"introduced":"38ab3dd5b1df946aecf5bd085c671c86f46f68eb"},{"fixed":"9ee9d0a0cafd5e5fe3b271d2280b090ab6e64048"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"1.72.0"},{"last_affected":"1.74.4"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"DESCRIPTION","range":[{"introduced":"0"},{"fixed":"1.75.0"}]}]}}],"versions":["v1.74.0","v1.73.0","v1.72.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-79775.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}