USN-8494-1

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Source
https://ubuntu.com/security/notices/USN-8494-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8494-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8494-1
Upstream
Related
Published
2026-07-02T13:22:47Z
Modified
2026-07-02T18:19:26.963689699Z
Summary
libvncserver vulnerability
Details

It was discovered that LibVNCServer incorrectly handled the Tight decoder in libvncclient. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code.

References

Affected packages

Ubuntu:22.04:LTS / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.13+dfsg-3ubuntu0.2

Affected versions

0.*
0.9.13+dfsg-3
0.9.13+dfsg-3build1
0.9.13+dfsg-3build2
0.9.13+dfsg-3ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.13+dfsg-3ubuntu0.2",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.13+dfsg-3ubuntu0.2",
            "binary_name": "libvncserver1"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-50538",
            "severity": [
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8494-1.json"

Ubuntu:24.04:LTS / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.14+dfsg-1ubuntu0.2

Affected versions

0.*
0.9.14+dfsg-1
0.9.14+dfsg-1build1
0.9.14+dfsg-1build2
0.9.14+dfsg-1ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.14+dfsg-1ubuntu0.2",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.14+dfsg-1ubuntu0.2",
            "binary_name": "libvncserver1"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:24.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-50538",
            "severity": [
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8494-1.json"

Ubuntu:25.10 / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.15+dfsg-1ubuntu0.2

Affected versions

0.*
0.9.14+dfsg-1build2
0.9.15+dfsg-1
0.9.15+dfsg-1ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.15+dfsg-1ubuntu0.2",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.15+dfsg-1ubuntu0.2",
            "binary_name": "libvncserver1"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:25.10",
    "cves": [
        {
            "id": "CVE-2026-50538",
            "severity": [
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8494-1.json"

Ubuntu:26.04:LTS / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.15+dfsg-3ubuntu0.2

Affected versions

0.*
0.9.15+dfsg-1
0.9.15+dfsg-2
0.9.15+dfsg-3
0.9.15+dfsg-3ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.15+dfsg-3ubuntu0.2",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.15+dfsg-3ubuntu0.2",
            "binary_name": "libvncserver1"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:26.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-50538",
            "severity": [
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8494-1.json"