CVE-2026-18187: A format string vulnerability was found in the Internal Backup on the ADM

Q: How do I fix CVE-2026-18187?

data master: upgrade to 5.1.4.rjv2. Exact commands for each OS are on this page.

Q: Is CVE-2026-18187 being exploited?

CVE-2026-18187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-18187 affect?

CVE-2026-18187 affects data master. Severity is high (CVSS 8.1). A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenti

Routine

HIGH 8.1UPGRADE

CVE-2026-18187 is a high-severity flaw (CVSS 8.1) affecting data master. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected CGI process. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-134
Published	2026-07-30
Last modified	2026-10-23

Publisher (CNA): ASUSTOR, Inc. · Vendor: asustor

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-30 03:16 UTCPublished CVE record published
2026-10-23 22:10 UTCUpdated Record last modified

asustor data master UPGRADE

Affected: >= 4.1.0.rhu2 and <= 4.3.3.run1 · >= 5.0.0.ra82 and < 5.1.4.rjv2

Fixed in: 5.1.4.rjv2

Safe to downgrade to: a release before 4.1.0.rhu2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source

sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-18187?

data master: upgrade to 5.1.4.rjv2. Exact commands for each OS are on this page.

Is CVE-2026-18187 being exploited?

CVE-2026-18187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-18187 affect?

CVE-2026-18187 affects data master. Severity is high (CVSS 8.1). A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenti

How urgent is CVE-2026-18187?

Priority 38/100. High severity

Related CVEs

CVE-2026-67248 HIGH 8.8 UPGRADE A stack-based buffer overflow vulnerability was found in the File Explorer on the ADM
CVE-2026-18186 HIGH 8.1 UPGRADE A stored format string vulnerability was found in the FTP Backup on the ADM
CVE-2026-18188 HIGH 8.1 UPGRADE A format string vulnerability was found in the Rsync Backup on the ADM
CVE-2026-67244 HIGH 7.2 UPGRADE A format string vulnerability was found in the Notification OAuth settings of ADM
CVE-2026-67245 HIGH 8.1 UPGRADE A path traversal vulnerability was found in the VPN Clients on the ADM

References

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