ubuntu-cve-2026-32854
Vulnerability from osv_ubuntu
Published
2026-03-24 18:16
Modified
2026-06-23 20:10
Summary
Details
LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
},
{
"binary_name": "xtightvncviewer",
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}
]
},
"package": {
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"name": "tightvnc",
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},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.9-6.4",
"1.3.9-6.4ubuntu1",
"1.3.9-6.5+deb8u1build0.14.04.1~esm1"
]
},
{
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{
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"binary_version": "0.9.13-1.1"
},
{
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}
]
},
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},
"ranges": [
{
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{
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}
],
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}
],
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]
},
{
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{
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},
{
"binary_name": "libvncserver-config",
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},
{
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}
]
},
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},
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{
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{
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}
],
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"0.9.10+dfsg-3ubuntu0.16.04.3",
"0.9.10+dfsg-3ubuntu0.16.04.4",
"0.9.10+dfsg-3ubuntu0.16.04.5",
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]
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{
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"3.8.1-0ubuntu9",
"3.8.1-0ubuntu9.1",
"3.8.1-0ubuntu9.2",
"3.8.1-0ubuntu9.3",
"3.8.1-0ubuntu9.4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "italc-client",
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{
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},
{
"binary_name": "italc-master",
"binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
},
{
"binary_name": "libitalccore",
"binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
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},
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{
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{
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"versions": [
"1:2.0.2+dfsg1-3",
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]
},
{
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"binaries": [
{
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{
"binary_name": "xtightvncviewer",
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"package": {
"ecosystem": "Ubuntu:16.04:LTS",
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},
{
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"binaries": [
{
"binary_name": "x11vnc",
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},
{
"binary_name": "x11vnc-data",
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}
]
},
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{
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]
},
{
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"binaries": [
{
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{
"binary_name": "libvncserver-config",
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},
{
"binary_name": "libvncserver1",
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}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
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},
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{
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]
},
{
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"binaries": [
{
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}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "vino",
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},
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{
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"type": "ECOSYSTEM"
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"versions": [
"3.8.1-0ubuntu12",
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]
},
{
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"binaries": [
{
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},
{
"binary_name": "italc-management-console",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
},
{
"binary_name": "italc-master",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
},
{
"binary_name": "libitalccore",
"binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
}
]
},
"package": {
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},
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{
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{
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],
"versions": [
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},
{
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"binaries": [
{
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{
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}
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},
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{
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{
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{
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}
]
},
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},
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{
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{
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},
{
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"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.12+dfsg-9ubuntu0.3"
},
{
"binary_name": "libvncserver1",
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}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver@0.9.12+dfsg-9ubuntu0.3?arch=source\u0026distro=focal"
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"0.9.12+dfsg-8",
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"0.9.12+dfsg-9ubuntu0.3"
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{
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{
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"versions": [
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"3.22.0-5ubuntu2.1",
"3.22.0-5ubuntu2.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncserver",
"binary_version": "1.3.10-0ubuntu5"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1.3.10-0ubuntu5"
}
]
},
"package": {
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},
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{
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{
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],
"type": "ECOSYSTEM"
}
],
"versions": [
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libveyon-core",
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},
{
"binary_name": "veyon-configurator",
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},
{
"binary_name": "veyon-master",
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},
{
"binary_name": "veyon-plugins",
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},
{
"binary_name": "veyon-service",
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}
]
},
"package": {
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"name": "veyon",
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},
"ranges": [
{
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{
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],
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
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}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "x11vnc",
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},
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{
"events": [
{
"introduced": "0"
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],
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}
],
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]
},
{
"ecosystem_specific": {
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{
"binary_name": "libvncclient1",
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{
"binary_name": "libvncserver1",
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}
]
},
"package": {
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{
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]
},
{
"ecosystem_specific": {
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{
"binary_name": "tightvncpasswd",
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},
{
"binary_name": "tightvncserver",
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},
"package": {
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"name": "tightvnc",
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},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
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],
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"1:1.3.10-5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libveyon-core",
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},
{
"binary_name": "veyon-configurator",
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},
{
"binary_name": "veyon-master",
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},
{
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},
{
"binary_name": "veyon-service",
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}
]
},
"package": {
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},
{
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{
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}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
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},
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{
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}
],
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]
},
{
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"binaries": [
{
"binary_name": "x11vnc",
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}
]
},
"package": {
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"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc@0.9.16-8?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.16-7",
"0.9.16-7build1",
"0.9.16-8"
]
},
{
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{
"binary_name": "libvncclient1",
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},
{
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}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver@0.9.14+dfsg-1ubuntu0.1?arch=source\u0026distro=noble"
},
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}
],
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"0.9.14+dfsg-1build2"
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},
{
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{
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},
{
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},
{
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},
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"1:1.3.10-7build1",
"1:1.3.10-7build2",
"1:1.3.10-8"
]
},
{
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},
{
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{
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},
{
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},
{
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}
]
},
"package": {
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},
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{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.7.5+repack1-1build2",
"4.7.5+repack1-1ubuntu1",
"4.7.5+repack1-1ubuntu3",
"4.7.5+repack1-1ubuntu4",
"4.7.5+repack1-1ubuntu5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "vino",
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}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "vino",
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},
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{
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{
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}
],
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}
],
"versions": [
"3.22.0-6ubuntu3",
"3.22.0-6ubuntu4",
"3.22.0-6ubuntu5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.16-10"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc@0.9.16-10?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.16-9",
"0.9.16-9ubuntu1",
"0.9.16-10"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libvncclient1",
"binary_version": "0.9.15+dfsg-1ubuntu0.1"
},
{
"binary_name": "libvncserver1",
"binary_version": "0.9.15+dfsg-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "libvncserver",
"purl": "pkg:deb/ubuntu/libvncserver@0.9.15+dfsg-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
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},
{
"fixed": "0.9.15+dfsg-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.14+dfsg-1build2",
"0.9.15+dfsg-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tightvncpasswd",
"binary_version": "1:1.3.10-10"
},
{
"binary_name": "tightvncserver",
"binary_version": "1:1.3.10-10"
},
{
"binary_name": "xtightvncviewer",
"binary_version": "1:1.3.10-10"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc@1:1.3.10-10?arch=source\u0026distro=questing"
},
"ranges": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.3.10-9",
"1:1.3.10-10"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libveyon-core",
"binary_version": "4.9.7+repack1-1"
},
{
"binary_name": "veyon-configurator",
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},
{
"binary_name": "veyon-master",
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{
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"binary_version": "4.9.7+repack1-1"
},
{
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"binary_version": "4.9.7+repack1-1"
}
]
},
"package": {
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"name": "veyon",
"purl": "pkg:deb/ubuntu/veyon@4.9.7+repack1-1?arch=source\u0026distro=questing"
},
"ranges": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.7.5+repack1-1ubuntu6",
"4.7.5+repack1-1ubuntu7",
"4.9.7+repack1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "vino",
"binary_version": "3.22.0-7ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "vino",
"purl": "pkg:deb/ubuntu/vino@3.22.0-7ubuntu1?arch=source\u0026distro=questing"
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{
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],
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],
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.17-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc@0.9.17-1?arch=source\u0026distro=questing"
},
"ranges": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.16-10",
"0.9.17-1"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "tightvnc",
"purl": "pkg:deb/ubuntu/tightvnc@1:1.3.10-10build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.3.10-10",
"1:1.3.10-10build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libveyon-core",
"binary_version": "4.9.7+repack1-1build1"
},
{
"binary_name": "veyon-configurator",
"binary_version": "4.9.7+repack1-1build1"
},
{
"binary_name": "veyon-master",
"binary_version": "4.9.7+repack1-1build1"
},
{
"binary_name": "veyon-plugins",
"binary_version": "4.9.7+repack1-1build1"
},
{
"binary_name": "veyon-service",
"binary_version": "4.9.7+repack1-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "veyon",
"purl": "pkg:deb/ubuntu/veyon@4.9.7+repack1-1build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.9.7+repack1-1",
"4.9.7+repack1-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "x11vnc",
"binary_version": "0.9.17-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "x11vnc",
"purl": "pkg:deb/ubuntu/x11vnc@0.9.17-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.17-1",
"0.9.17-2"
]
}
],
"aliases": [],
"details": "LibVNCServer versions 0.9.15 and prior (fixed in\u00a0commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.",
"id": "UBUNTU-CVE-2026-32854",
"modified": "2026-06-23T20:10:25Z",
"published": "2026-03-24T18:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-32854"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-32854"
},
{
"type": "REPORT",
"url": "https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x"
},
{
"type": "REPORT",
"url": "https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8463-1"
}
],
"related": [
"USN-8463-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-32854"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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