Hoverfly allows an arbitrary file read in the /api/v2/simulation endpoint (GHSL-2023-274)

Exploitation

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

CVSS 4.0

8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2024-45388: 55.57% estimated exploitation activity in the next 30 days; percentile 99.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Details The /api/v2/simulation POST handler allows users to create new simulation views from the contents of a user-specified file. This feature can be abused by an attacker to read arbitrary files from the Hoverfly server. Note that, although the code prevents absolute paths from being specified, an attacker can escape out of the hf.Cfg.ResponsesBodyFilesPath base path by using ../ segments and reach any arbitrary files. This issue was found using the Uncontrolled data used in path expression CodeQL query for python. Proof of Concept Send the following POST request to read the /etc/passwd file: Response will contain the Hoverfly's server /etc/passwd Impact This issue may lead to Information Disclosure. Remediation The code is preventing absolute paths from being read. Make sure the final path (filepath.Join(hf.Cfg.ResponsesBodyFilesPath, filePath)) is contained within the expected base path (filepath.Join(hf.Cfg.ResponsesBodyFilesPath, "/"))

Published by the source

3 Sep 2024, 21:01 UTC

Last modified by the source

19 Sep 2024, 18:28 UTC

Source last checked

26 Oct 2026, 15:05 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-6xx4-x46f-f897

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# Patch Next advisory brief: CVE-2024-45388

Advisory: Hoverfly allows an arbitrary file read in the `/api/v2/simulation` endpoint (`GHSL-2023-274`)
IDs: CVE-2024-45388, GHSA-6xx4-x46f-f897
Record: https://patchnext.com/advisories/cve-2024-45388 (revision 1, source checked 26 Oct 2026, 15:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/spectolabs/hoverfly 1.10.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/spectolabs/hoverfly: affected < 1.10.3; fixed in 1.10.3

## Suggested inspection (read-only)
- Go github.com/spectolabs/hoverfly: 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/spectolabs/hoverfly.
- 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-6xx4-x46f-f897 (GitHub-reviewed advisory GHSA-6xx4-x46f-f897 lists affected ranges: Go github.com/spectolabs/hoverfly >=0 <1.10.3)

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