charmbracelet/soft-serve HTTP responses disclose the existence and names of private repositories

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Summary Soft Serve answers Go's `?go-get=1` requests by walking up the requested path until it finds a repository, then rendering that repository's name and clone URL into a `go-import` meta tag. The walk checked that each candidate repository existed, but never that the caller could read it. A request for a path inside a private repository, such as `GET /secret/anything?go-get=1`, therefore returned `200` naming `secret` and its clone URL, even though `GET /secret?go-get=1` correctly returned `404`. The same `?go-get=1` exception in the HTTP access middleware also let requests reach the LFS and dumb-HTTP routes with the repository existence check skipped, where two LFS handlers dereferenced the missing repository and panicked. The same disclosure appears without `?go-get=1`. The Git and LFS routes answered a repository the caller could not read differently depending on whether it existed: an anonymous clone of a private repository got `401` while a missing one got `404`, and a…

Published by the source

30 Oct 2026, 14:42 UTC

Last modified by the source

30 Oct 2026, 15:00 UTC

Source last checked

31 Oct 2026, 06:45 UTC

1. Revision 2 · amended · 31 Oct 2026

   Amended from osv record GHSA-fgxm-5hvv-x4vh

2. Revision 1 · created · 30 Oct 2026

   Published from ghsa record GHSA-fgxm-5hvv-x4vh

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# Patch Next advisory brief: GHSA-fgxm-5hvv-x4vh

Advisory: charmbracelet/soft-serve HTTP responses disclose the existence and names of private repositories
IDs: GHSA-fgxm-5hvv-x4vh
Record: https://patchnext.com/advisories/ghsa-fgxm-5hvv-x4vh (revision 2, source checked 31 Oct 2026, 06:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/charmbracelet/soft-serve 0.12.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/charmbracelet/soft-serve: affected >= 0.5.0, < 0.12.3; fixed in 0.12.3

## Suggested inspection (read-only)
- Go github.com/charmbracelet/soft-serve: 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/charmbracelet/soft-serve.
- 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://github.com/advisories/GHSA-fgxm-5hvv-x4vh (GitHub-reviewed advisory GHSA-fgxm-5hvv-x4vh lists affected ranges: Go github.com/charmbracelet/soft-serve >=0.5.0 <0.12.3)
- Verified: https://osv.dev/vulnerability/GHSA-fgxm-5hvv-x4vh (OSV record GHSA-fgxm-5hvv-x4vh lists affected ranges: Go github.com/charmbracelet/soft-serve >=0.5.0 <0.12.3 (fixed))

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