PYSEC-2026-3830
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/document-merge-service/PYSEC-2026-3830.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-3830
- Aliases
-
- CVE-2026-53964
- GHSA-w47q-945m-q9pc
- Published
- 2026-09-10T09:44:51Z
- Modified
- 2026-09-10T12:15:05Z
- Severity
-
- 7.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- Document Merge Service vulnerable to RCE via SSTI (xlsx tempaltes)
- Details
-
Impact
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. The vulnerability is limited to XLSX templates, were the
xltpllibrary uses a npn-sandboxed Jinja environment for the processing of the template.Patches
It has been patched in v9.1.0
Workarounds
Disable the upload/usage of XLSX templates.
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
- References
-
- https://github.com/adfinis/document-merge-service/security/advisories/GHSA-w47q-945m-q9pc
- https://github.com/adfinis/document-merge-service
- https://github.com/adfinis/document-merge-service/releases/tag/v9.1.0
- https://pypi.org/project/document-merge-service
- https://github.com/advisories/GHSA-w47q-945m-q9pc
- https://nvd.nist.gov/vuln/detail/CVE-2026-53964
Affected packages
PyPI / document-merge-service
Package
- Name
- document-merge-service
- View open source insights on deps.dev
- Purl
- pkg:pypi/document-merge-service
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed9.1.0