Medium [CVE-2026-79778] Denial of Service via WebDAV TUS nil-response panic
This medium-severity Red Hat Linux advisory covers CVE-2026-79778 affecting Cryostat 4, Red Hat Advanced Cluster Management for Kubernetes 2.
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Summary
rclone before v1.75.0 contains a denial of service vulnerability in the WebDAV TUS creation handler that dereferences a nil response before checking for transport errors.
A malicious or compromised configured endpoint can reset connections during TUS uploads to trigger a panic that terminates unrecovered goroutines and halts unrelated work in long-lived processes. A flaw was found in rclone.
This leads to a complete disruption of service. When using the WebDAV backend with TUS (resumable upload) support, a nil pointer dereference panic can occur if the server returns a nil HTTP response during a TUS upload operation.
A malicious or misconfigured WebDAV server can trigger this condition, causing the rclone process to crash. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-476. Affected Red Hat products: Cryostat 4; Red Hat Advanced Cluster Management for Kubernetes 2.
Red Hat does not currently list a fixing RHSA for this CVE.
- < 75.0
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Avoid using rclone's WebDAV backend with TUS-enabled servers from untrusted sources. If TUS uploads are not required, use a WebDAV server configuration that does not advertise TUS support.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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