rclone before v1.75.0 contains a denial of service vulnerability in the WebDAV TUS creation handler that dereferences a nil response before checking… (CVE-2026-79778)
Description
rclone versions before v1.75.0 contain a denial of service vulnerability in the WebDAV TUS creation handler. This flaw occurs because the handler dereferences a nil response before checking for transport errors. A malicious or compromised configured endpoint can exploit this by resetting connections during TUS uploads, causing a panic that terminates unrecovered goroutines and halts unrelated work in long-lived processes. The vulnerability has a medium severity with a CVSS score of 5.3.
CVSS v3.1
Score 5.3medium
Affected software
pkg:deb/ubuntu/rclone?arch=source&distro=bionicpkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/rclone?arch=source&distro=stonkingpkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in rclone prior to version 1.75.0 involves the WebDAV TUS creation handler dereferencing a nil response without first verifying transport errors. This improper handling allows a malicious or compromised endpoint to reset connections during TUS uploads, triggering a panic in the Go runtime. The panic terminates unrecovered goroutines, which can halt unrelated work in long-running processes, resulting in a denial of service condition.
Potential Impact
Exploitation of this vulnerability leads to denial of service by causing the rclone process to panic and halt unrelated goroutines. This disrupts normal operation of long-lived rclone processes that use WebDAV TUS uploads, potentially causing service interruptions or failures.
Mitigation Recommendations
A fix is available in rclone version 1.75.0 and later. Users should upgrade to version 1.75.0 or newer to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-79778
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6ad3f56c2cdf04f6566620fc
Added to database: 10/17/2026, 22:23:40 UTC
Last enriched: 10/17/2026, 23:37:04 UTC
Last updated: 10/17/2026, 23:37:04 UTC
Views: 2
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