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Medium, CVSS 5.1amended

rclone: Verbose Stack Trace Disclosure in RC API Error Responses

CVE-2026-79777GHSA-gwfq-86j8-7qhv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/rclone/rclone 1.75.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X · score source
EPSS
  • CVE-2026-79777: 0.30% estimated exploitation activity in the next 30 days; percentile 22.70 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary When an RC API call triggers a panic (recovered by the job runner), the full Go stack trace is included in the JSON error response. This leaks internal file paths, Go module versions, goroutine state, and memory addresses to the API caller. Details The panic recovery in fs/rc/jobs/job.go:110-115: The full debug.Stack() output is placed into j.Error, which is then returned in the HTTP response JSON. PoC Trigger a parse error by setting config path to a non-INI file, then calling dump: Response includes: Disclosed information includes: - Full filesystem paths (github.com/rclone/rclone/fs/config/config.go:377) - Go module versions (github.com/go-chi/chi/v5@v5.2.5) - Go runtime version (from binary) - Goroutine IDs and states - Memory addresses (ASLR leak) - File contents (first unparseable line of the target file) Tested and confirmed on rclone v1.74.4. Impact Information disclosure that aids exploitation of other vulnerabilities. Stack traces reveal internal architecture,…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-gwfq-86j8-7qhv

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GO-2026-6181

  4. Revision 1 · created ·

    Published from osv record GHSA-gwfq-86j8-7qhv

Agent brief

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# Patch Next advisory brief: CVE-2026-79777

Advisory: rclone: Verbose Stack Trace Disclosure in RC API Error Responses
IDs: CVE-2026-79777, GHSA-gwfq-86j8-7qhv
Record: https://patchnext.com/advisories/cve-2026-79777 (revision 4, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/rclone/rclone 1.75.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/rclone/rclone: affected <= 1.74.4; fixed in 1.75.0

## Suggested inspection (read-only)
- Go github.com/rclone/rclone: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/rclone/rclone.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-gwfq-86j8-7qhv (OSV record GHSA-gwfq-86j8-7qhv lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.0 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6181 (OSV record GO-2026-6181 lists affected ranges: Go github.com/rclone/rclone >=0 <1.75.0 (fixed))
- Verified: https://github.com/advisories/GHSA-gwfq-86j8-7qhv (GitHub-reviewed advisory GHSA-gwfq-86j8-7qhv lists affected ranges: Go github.com/rclone/rclone >=0 <=1.74.4)

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