document-merge-service vulnerable to Remote Code Execution via Server-Side Template Injection

Exploitation

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

CVSS

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

EPSS

• CVE-2024-37301: 1.04% estimated exploitation activity in the next 30 days; percentile 64.04 (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.

Impact What kind of vulnerability is it? Who is impacted? A remote code execution (RCE) via server-side template injection (SSTI) allows for user supplied code to be executed in the server's context where it is executed as the document-merge-server user with the UID 901 thus giving an attacker considerable control over the container. Patches Has the problem been patched? What versions should users upgrade to? It has been patched in v6.5.2 References Are there any links users can visit to find out more? - https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti POC Add the following to a document, upload and render it: The index might be different, so to debug this first render a template with {{ PLACEHOLDER.class.mro[1].subclasses() }} and then get the index of subprocess.Popen and replace 202 with that.

Published by the source

11 Jun 2024, 20:22 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:36 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-v5gf-r78h-55q6

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-v5gf-r78h-55q6

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# Patch Next advisory brief: CVE-2024-37301

Advisory: document-merge-service vulnerable to Remote Code Execution via Server-Side Template Injection
IDs: CVE-2024-37301, GHSA-v5gf-r78h-55q6
Record: https://patchnext.com/advisories/cve-2024-37301 (revision 2, source checked 26 Oct 2026, 13:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: document-merge-service 6.5.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI document-merge-service: affected < 6.5.2; fixed in 6.5.2

## Suggested inspection (read-only)
- `python -m pip show document-merge-service`: prints the installed version. Run with the environment that serves production active.

## 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 document-merge-service.
- 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-v5gf-r78h-55q6 (OSV record GHSA-v5gf-r78h-55q6 lists affected ranges: PyPI document-merge-service >=0 <6.5.2 (fixed))
- Verified: https://github.com/advisories/GHSA-v5gf-r78h-55q6 (GitHub-reviewed advisory GHSA-v5gf-r78h-55q6 lists affected ranges: PyPI document-merge-service >=0 <6.5.2)

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