# CVE-2026-105157: RainyGao DocSys path traversal in document controller

Source: https://junglewise.ai/threats/cve-2026-105157-a-security-vulnerability-has-been-detected-in-rainygao-docsys-up  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-04. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-105157 · Severity: medium · CVSS 4.3 · Published 2026-10-04

RainyGao DocSys is a document management system that stores and serves files to users. A path traversal vulnerability in the temporary file download endpoint allows any authenticated user to read arbitrary files accessible to the application process, such as system configuration files or private keys.

Technologies: [RainyGao DocSys](https://junglewise.ai/threats/technologies/docsys). Vendors: [RainyGao](https://junglewise.ai/threats/vendors/rainygao).

## Quick answers

**Is CVE-2026-105157 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105157 being exploited in the wild.

**How severe is CVE-2026-105157?** Medium severity, with a CVSS score of 4.3, published 4 October 2026.

**Which products and versions are affected?** RainyGao DocSys up to 2.02.85.

**Is there a fix for CVE-2026-105157?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-105157 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-105157?** Check whether you run RainyGao DocSys at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The DocController.doGetTmp endpoint accepts unfiltered path and fileName parameters from HTTP requests and concatenates them without canonicalization or boundary validation. An authenticated attacker can supply path traversal sequences like "../../../" to escape the intended temporary directory and read any file the Tomcat process has permission to access. Only login is required; no additional privilege or file access checks are performed.

## Affected products

- RainyGao DocSys up to 2.02.85

## Timeline

- 2026-08-21: disclosed
- 2026-10-04: advisory

## References

- [https://gitee.com/RainyGao/DocSys/](https://gitee.com/RainyGao/DocSys/)
- [https://gitee.com/RainyGao/DocSys/issues/IKA7W8](https://gitee.com/RainyGao/DocSys/issues/IKA7W8)

## Related threats

- [RainyGao DocSys SQL injection in database reset](https://junglewise.ai/threats/cve-2026-105158-a-vulnerability-was-detected-in-rainygao-docsys-up-to-2-02-85)
- [DocSys unauthenticated arbitrary file download via downloadDocEx](https://junglewise.ai/threats/cve-2026-75413-docsys-unauthenticated-arbitrary-file-download-via-downloaddocex)
- [RainyGao DocSys arbitrary file upload to code execution](https://junglewise.ai/threats/cve-2026-67678-rainygao-docsys-arbitrary-file-upload-to-code-execution)