# CVE-2026-18188: ASUSTOR ADM format string vulnerability in Rsync Backup

Source: https://junglewise.ai/threats/cve-2026-18188-asustor-adm-format-string-vulnerability-in-rsync-backup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-30. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-18188 · Severity: info · CVSS 7.1 · Published 2026-07-30

ASUSTOR ADM is the operating system used to manage ASUSTOR Network Attached Storage (NAS) devices. A security flaw in the Rsync Backup component allows a logged-in user to crash the backup service or view sensitive system memory information. This could lead to data backup failures or provide an attacker with information needed for further system compromise.

Technologies: [ASUSTOR ADM](https://junglewise.ai/threats/technologies/adm). Vendors: [ASUSTOR](https://junglewise.ai/threats/vendors/asustor).

## Quick answers

**Is CVE-2026-18188 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18188 being exploited in the wild.

**How severe is CVE-2026-18188?** Informational severity, with a CVSS score of 7.1, published 30 July 2026.

**Which products and versions are affected?** ASUSTOR ADM 4.1.0 through 4.3.3.RUN1, 5.0.0 through 5.1.3.RI81.

**Is there a fix for CVE-2026-18188?** 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-2026-18188 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-18188?** Check whether you run ASUSTOR ADM 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

A format string vulnerability (CWE-134) exists in the Rsync Backup component of ASUSTOR ADM. The issue stems from the unsafe processing of user-controlled rsync backup configuration or log data through format string operations. An authenticated attacker with network access can exploit this by providing specially crafted input, leading to information disclosure from the process memory or a denial of service (DoS) via a crash of the backup component. The vulnerability affects ADM versions 4.1.0 through 4.3.3.RUN1 and 5.0.0 through 5.1.3.RI81.

## Affected products

- ASUSTOR ADM 4.1.0 through 4.3.3.RUN1, 5.0.0 through 5.1.3.RI81

## Timeline

- 2026-07-30: advisory: NVD publication date
- 2026-07-29: disclosed: ASUSTOR advisory release

## References

- [https://www.asustor.com/security/security_advisory_detail?id=67](https://www.asustor.com/security/security_advisory_detail?id=67)

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