# CVE-2026-111385: Nezha host header injection in file transfer URLs

Source: https://junglewise.ai/threats/cve-2026-111385-nezha-from-2-1-0-before-2-3-15-contains-a-host-header-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-16. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-111385 · Severity: medium · CVSS 4.8 · Published 2026-10-16

Nezha is a server monitoring and management platform. A vulnerability in its file transfer feature allows attackers to manipulate the Host header in requests to redirect file uploads or intercept one-time download tokens, potentially leading to file exfiltration. This affects versions 2.1.0 through 2.3.14.

Technologies: [Nezha](https://junglewise.ai/threats/technologies/nezha-nezha). Vendors: [Nezha](https://junglewise.ai/threats/vendors/nezha).

## Quick answers

**Is CVE-2026-111385 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111385 being exploited in the wild.

**How severe is CVE-2026-111385?** Medium severity, with a CVSS score of 4.8, published 16 October 2026.

**Which products and versions are affected?** Nezha 2.1.0 through 2.3.14.

**Is there a fix for CVE-2026-111385?** Yes: fixed in 2.3.15. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-111385 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-111385?** Check whether you run Nezha 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.

## How to fix

- Fixed in 2.3.15

## Technical details

The mintTransferTool component in Nezha builds file download and upload URLs (fs.download_url and fs.upload_url) using an unvalidated Host header from HTTP requests. An attacker who can control the Host header on a victim's request can redirect file uploads to attacker-controlled servers or capture one-time download tokens for replay attacks to exfiltrate files.

## Affected products

- Nezha Nezha 2.1.0 through 2.3.14

## Timeline

- 2026-10-16: disclosed
- 2026-10-01: patched

## References

- [https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f](https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f)
- [https://github.com/nezhahq/nezha/commit/c726930833937a0aebb2a924064f236faea889f6](https://github.com/nezhahq/nezha/commit/c726930833937a0aebb2a924064f236faea889f6)

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