CVE-2026-22899: A NULL pointer dereference vulnerability has been reported to affect File Station 6

Routine

MEDIUM 6.5UPGRADE

CVE-2026-22899 is a medium-severity flaw (CVSS 6.5) affecting file station. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-06-10
Last modified	2026-07-23

Publisher (CNA): QNAP Systems, Inc. · Vendor: qnap

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-10 04:17 UTCPublished CVE record published
2026-07-23 09:10 UTCUpdated Record last modified

qnap file station UPGRADE

Affected: >= 5.5.6.4691 and < 5.5.6.5208

Fixed in: 5.5.6.5208

Safe to downgrade to: a release before 5.5.6.4691

1. Check installed version

apt-cache policy file-station || rpm -q file-station || file-station --version

2. UPGRADE to 5.5.6.5208 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade file-station

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade file-station

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.5.6.4691 (Debian / Ubuntu)

apt-cache madison file-station sudo apt install file-station=<VERSION_BEFORE_5.5.6.4691> sudo apt-mark hold file-station

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list file-station sudo dnf downgrade file-station-<VERSION_BEFORE_5.5.6.4691> sudo dnf versionlock add file-station

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-22899?

file station: upgrade to 5.5.6.5208. Exact commands for each OS are on this page.

Is CVE-2026-22899 being exploited?

CVE-2026-22899 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-2026-22899 affect?

CVE-2026-22899 affects file station. Severity is medium (CVSS 6.5). A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the v

How urgent is CVE-2026-22899?

Priority 31/100. No elevated risk signals yet.

Software pages

QNAP vulnerabilities

Related CVEs

CVE-2026-24721 MEDIUM 6.5 UPGRADE A NULL pointer dereference vulnerability has been reported to affect File Station 5
CVE-2026-24722 MEDIUM 6.5 UPGRADE A NULL pointer dereference vulnerability has been reported to affect File Station 5
CVE-2026-24723 MEDIUM 6.5 UPGRADE A NULL pointer dereference vulnerability has been reported to affect File Station 5
CVE-2026-26241 CRITICAL 9.1 UPGRADE A buffer overflow vulnerability has been reported to affect File Station 5
CVE-2026-26240 CRITICAL 9.1 UPGRADE A buffer overflow vulnerability has been reported to affect File Station 5

References

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