CVE-2026-9776: ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability

Q: How do I fix CVE-2026-9776?

unizon: upgrade to 2.7.264. Exact commands for each OS are on this page.

Q: Is CVE-2026-9776 being exploited?

CVE-2026-9776 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-2026-9776 affect?

CVE-2026-9776 affects unizon. Severity is high (CVSS 7.5). ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of ATEN Unizon. Authentication is no

Q: How urgent is CVE-2026-9776?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-9776 is a high-severity flaw (CVSS 7.5) affecting unizon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of ATEN Unizon. Authentication is not required to exploit this vulnerability. The specific flaw exists within the writeFileToHttpServletResponse method. The issue results from the lack of proper validation of a user-supplied path prior to using

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-06-24
Last modified	2026-10-25

Publisher (CNA): Zero Day Initiative · Vendor: aten

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 22:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

aten unizon UPGRADE

Affected: < 2.7.264

Fixed in: 2.7.264

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unizon || rpm -q unizon || unizon --version

2. UPGRADE to 2.7.264 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unizon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unizon

Note

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

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-2026-9776?

unizon: upgrade to 2.7.264. Exact commands for each OS are on this page.

Is CVE-2026-9776 being exploited?

CVE-2026-9776 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-2026-9776 affect?

CVE-2026-9776 affects unizon. Severity is high (CVSS 7.5). ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of ATEN Unizon. Authentication is no

How urgent is CVE-2026-9776?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-9777 HIGH 7.2 UPGRADE ATEN Unizon restoreDB Directory Traversal Remote Code Execution Vulnerability
CVE-2026-9778 HIGH 7.2 UPGRADE ATEN Unizon ImportDeviceList Directory Traversal Remote Code Execution Vulnerability
CVE-2026-9774 MEDIUM 6.5 UPGRADE ATEN Unizon updateLicense Directory Traversal Arbitrary File Deletion Vulnerability
CVE-2026-9775 MEDIUM 6.5 UPGRADE ATEN Unizon uploadSSL Directory Traversal Arbitrary File Deletion Vulnerability
CVE-2026-9779 HIGH 7.2 UPGRADE ATEN Unizon doCryptoHugeFileToFile Improper Verification of Cryptographic Signature Remote Code Execution Vuln

References

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