UBUNTU-CVE-2026-128321

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Source
https://ubuntu.com/security/CVE-2026-128321
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-128321
Upstream
  • CVE-2026-128321
Published
2026-11-13T00:00:00Z
Modified
2026-11-13T21:05:41Z
Severity
  • Ubuntu - medium
Summary
[none]
Details

Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow because an attacker-controlled framebuffer rectangle width is not validated against a fixed-size decoding buffer. A malicious VNC server can cause an out-of-bounds heap write when a user connects, resulting in application crash and potentially other memory-corruption impacts.

References

Affected packages

Ubuntu:16.04:LTS
tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.3.10-0ubuntu2
1.3.10-0ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.10-0ubuntu3"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.10-0ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:18.04:LTS
tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.3.10-0ubuntu3
1.3.10-0ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.10-0ubuntu4"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.10-0ubuntu4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:20.04:LTS
tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.3.10-0ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.10-0ubuntu5"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.10-0ubuntu5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:22.04:LTS
tightvnc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.3.10-3
1:1.3.10-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-5"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-5"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:24.04:LTS
tightvnc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.3.10-7
1:1.3.10-7build1
1:1.3.10-7build2
1:1.3.10-8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-8"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-8"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:26.04:LTS
tightvnc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.3.10-10
1:1.3.10-10build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-10build1"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-10build1"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-10build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:26.10
tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:1.*
1:1.3.10-10build1
1:1.3.10-11

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-11"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-11"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"
Ubuntu:Pro:14.04:LTS
tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.3.9-6.4
1.3.9-6.4ubuntu1
1.3.9-6.5+deb8u1build0.14.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-128321.json"