rclone: Infinite Scale TUS Creation Transport Error Causes a Nil-Response Panic
## 1. Summary A transport failure during the initial Infinite Scale TUS creation POST can return `(nil response, non-nil error)`. Rclone dereferences the nil response before processing the error and panics. The production `CreateUploader` path reproduced the crash against a closed endpoint. The security case is deployment-dependent. A one-shot upload already fails when its endpoint resets, while RC jobs recover panics in `fs/rc/jobs/job.go` and return a job error. The incremental denial of service is strongest in a long-lived VFS mount or concurrent/multi-remote CLI process where the upload runs in an unrecovered goroutine and the panic terminates unrelated work. ## 2. Affected Assets & Attack Surface - Verified rclone revision: `a0c09f1381ae93e2a9a33c529d170186c61ad058` (`v1.74.0-240-ga0c09f138`) - Current-master check: `backend/webdav/tus.go` was unchanged at master commit `961266888fe797390c535386f3b3aa46f4853602` on 2026-07-18 - Response evaluation: `backend/webdav/tus.go:45-59` - Creation path: `backend/webdav/tus.go:61-107` - Unrecovered VFS caller: `vfs/write.go:71-81` - Contained RC caller: `fs/rc/jobs/job.go:107-115` - Configuration: Infinite Scale WebDAV uploads using TUS - Code triggers: any pre-response transport failure, including refusal, reset, timeout, DNS/TLS/proxy failure, or cancellation - Security trigger: a malicious/compromised configured endpoint resets an upload in a long-lived or multi-workload process ## 3. Technical Root Cause Analysis `getTusLocati
GO-2026-6183
Revision 1
Nil pointer dereference in Infinite Scale TUS uploads in github.com/rclone/rclone
During WebDAV Infinite Scale TUS upload creation, a transport failure can return a nil HTTP response along with an error. When handling the failure, rclone dereferences the nil response before checking the error, causing a panic that can crash the process in unrecovered contexts such as VFS mounts.
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:GO-2026-6183
github.com/rclone/rclone
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.75.0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.75.0"
}
]
}
],
"package": {
"name": "github.com/rclone/rclone",
"purl": "pkg:golang/github.com/rclone/rclone",
"ecosystem": "Go"
},
"database_specific": {
"source": "https://vuln.go.dev/ID/GO-2026-6183.json"
},
"ecosystem_specific": {
"imports": [
{
"path": "github.com/rclone/rclone/backend/webdav",
"symbols": [
"Fs.About",
"Fs.Copy",
"Fs.DirMove",
"Fs.List",
"Fs.ListP",
"Fs.Mkdir",
"Fs.Move",
"Fs.NewObject",
"Fs.Purge",
"Fs.Put",
"Fs.PutStream",
"Fs.Rmdir",
"Fs.getTusLocationOrRetry",
"NewFs",
"Object.CreateUploader",
"Object.ModTime",
"Object.Open",
"Object.Remove",
"Object.SetModTime",
"Object.Size",
"Object.Update",
"Uploader.Upload",
"Uploader.UploadChunk"
]
}
]
}
}
]- Related CVEs
- CVE-2026-79778
Source reference:
/aliases
Publisher severity
No explicit severity was provided.
- Event
- #15298 · Revision 1
- Added to Heist Feed
- Publisher date
GHSA-3x6r-wxxg-53vv
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:GHSA-3x6r-wxxg-53vv
github.com/rclone/rclone
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.75.0
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.75.0"
}
]
}
],
"package": {
"name": "github.com/rclone/rclone",
"purl": "pkg:golang/github.com/rclone/rclone",
"ecosystem": "Go"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-3x6r-wxxg-53vv/GHSA-3x6r-wxxg-53vv.json",
"last_known_affected_version_range": "<= 1.74.0"
}
}
]- Related CVEs
- CVE-2026-79778
Source reference:
/aliases
Publisher severity
No explicit severity was provided.
- Event
- #15299 · Revision 1
- Added to Heist Feed
- Publisher date