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CVE-2026-32853

LibVNCServer UltraZip Encoding Heap Out-of-bounds Read

6.9 MediumFix available

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.45%Up 0.4 points since Mar 25, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.9

LibVNCServer UltraZip Encoding Heap Out-of-bounds Read

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Record
CVE-2026-32853
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-125
Updated
2026-11-02
EUVDEUVD-2026-14930 6.9

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Record
EUVD-2026-14930
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 6.9

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Record
CVE-2026-32853
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSV 6.9

LibVNCServer UltraZip Encoding Heap Out-of-bounds Read

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Record
CVE-2026-32853
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-125
Updated
2026-11-02
OSVDEBIAN-CVE-2026-32853 8.1

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Record
DEBIAN-CVE-2026-32853
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-2252 8.1

libvncserver security update

libvncserver is a set of programs using the RFB (Remote Frame Buffer) protocol. They are designed to "export" a frame buffer via net: you set up a server and can connect to it via VNC viewers. If the server supports WebSockets (which LibVNCServer does), you can also connect using an in-browser VNC viewer like noVNC. It is already in wide use for administration, but it is not that easy to program a server yourself.

Security Fix(es):

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.(CVE-2026-32853)

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.(CVE-2026-32854)

Record
OESA-2026-2252
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
Show 13 moreShow less
OSVOESA-2026-2253 8.1

libvncserver security update

libvncserver is a set of programs using the RFB (Remote Frame Buffer) protocol. They are designed to "export" a frame buffer via net: you set up a server and can connect to it via VNC viewers. If the server supports WebSockets (which LibVNCServer does), you can also connect using an in-browser VNC viewer like noVNC. It is already in wide use for administration, but it is not that easy to program a server yourself.

Security Fix(es):

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.(CVE-2026-32853)

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.(CVE-2026-32854)

Record
OESA-2026-2253
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-2254 8.1

libvncserver security update

libvncserver is a set of programs using the RFB (Remote Frame Buffer) protocol. They are designed to "export" a frame buffer via net: you set up a server and can connect to it via VNC viewers. If the server supports WebSockets (which LibVNCServer does), you can also connect using an in-browser VNC viewer like noVNC. It is already in wide use for administration, but it is not that easy to program a server yourself.

Security Fix(es):

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.(CVE-2026-32853)

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.(CVE-2026-32854)

Record
OESA-2026-2254
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-2255 8.1

libvncserver security update

libvncserver is a set of programs using the RFB (Remote Frame Buffer) protocol. They are designed to "export" a frame buffer via net: you set up a server and can connect to it via VNC viewers. If the server supports WebSockets (which LibVNCServer does), you can also connect using an in-browser VNC viewer like noVNC. It is already in wide use for administration, but it is not that easy to program a server yourself.

Security Fix(es):

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.(CVE-2026-32853)

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.(CVE-2026-32854)

Record
OESA-2026-2255
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-32853 6.9

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

Record
UBUNTU-CVE-2026-32853
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVCLSA-2026-1789783613 No score

Fix CVE(s): CVE-2026-32853, CVE-2026-32854

  • SECURITY UPDATE: Heap out-of-bounds read in UltraZip subrect parsing
    • debian/patches/CVE-2026-32853.patch: bound the subrect cursor to the decompressed data in HandleUltraZipBPP() (libvncclient/ultra.c)
    • CVE-2026-32853
  • SECURITY UPDATE: NULL pointer dereference in httpd proxy handlers
    • debian/patches/CVE-2026-32854.patch: NULL-check the strchr() results in httpProcessInput() (libvncserver/httpd.c)
    • CVE-2026-32854
Record
CLSA-2026-1789783613
Updated
2026-11-02
OSVMGASA-2026-0315 No score

Updated libvncserver packages fix security vulnerabilities

The updated packages fix security vulnerabilities: Heap Out-of-Bounds Read in HandleUltraZipBPP due to unchecked subrectangle count. (CVE-2026-32853) NULL pointer dereferences in httpd proxy handlers via malformed CONNECT/GET requests. (CVE-2026-32854) LibVNCClient Tight Gradient decoding allows malicious server-triggered heap/stack OOB writes. (CVE-2026-44988) Attacker-controlled heap out-of-bounds write in libvncclient Tight decoder. (CVE-2026-50538)

Record
MGASA-2026-0315
Updated
2026-11-02
OSVopenSUSE-SU-2026:10433-1 No score

LibVNCServer-devel-0.9.15-2.1 on GA media

These are all security issues fixed in the LibVNCServer-devel-0.9.15-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10433-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20552-1 No score

Security update for LibVNCServer

This update for LibVNCServer fixes the following issues:

  • CVE-2026-32853: crafted FramebufferUpdate message can lead to information disclosure or denial of service (bsc#1260431).
  • CVE-2026-32854: crafted HTTP requests can cause a denial of service (bsc#1260429).
Record
openSUSE-SU-2026:20552-1
Updated
2026-11-02
OSVSUSE-SU-2026:1124-1 No score

Security update for LibVNCServer

This update for LibVNCServer fixes the following issues:

  • CVE-2026-32853: crafted FramebufferUpdate message can lead to information disclosure or denial of service (bsc#1260431).
  • CVE-2026-32854: crafted HTTP requests can cause a denial of service (bsc#1260429).
Record
SUSE-SU-2026:1124-1
Updated
2026-11-02
OSVSUSE-SU-2026:1173-1 No score

Security update for LibVNCServer

This update for LibVNCServer fixes the following issues:

  • CVE-2026-32853: crafted FramebufferUpdate message can lead to information disclosure or denial of service (bsc#1260431).
  • CVE-2026-32854: crafted HTTP requests can cause a denial of service (bsc#1260429).
Record
SUSE-SU-2026:1173-1
Updated
2026-11-02
OSVSUSE-SU-2026:1174-1 No score

Security update for LibVNCServer

This update for LibVNCServer fixes the following issues:

  • CVE-2026-32853: crafted FramebufferUpdate message can lead to information disclosure or denial of service (bsc#1260431).
  • CVE-2026-32854: crafted HTTP requests can cause a denial of service (bsc#1260429).
Record
SUSE-SU-2026:1174-1
Updated
2026-11-02
OSVSUSE-SU-2026:21206-1 No score

Security update for LibVNCServer

This update for LibVNCServer fixes the following issues:

  • CVE-2026-32853: crafted FramebufferUpdate message can lead to information disclosure or denial of service (bsc#1260431).
  • CVE-2026-32854: crafted HTTP requests can cause a denial of service (bsc#1260429).
Record
SUSE-SU-2026:21206-1
Updated
2026-11-02
OSVUSN-8463-1 No score

libvncserver vulnerabilities

It was discovered that LibVNCServer had a memory leak in the client cleanup function. An attacker could possibly use this issue to cause LibVNCServer to consume memory, leading to a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2020-29260)

It was discovered that LibVNCServer did not properly validate bounds when handling UltraZip encoding subrectangles. A remote attacker could possibly use this issue to obtain sensitive information or cause a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04. (CVE-2026-32853)

It was discovered that LibVNCServer did not properly validate return values in the HTTP proxy handlers. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04. (CVE-2026-32854)

It was discovered that LibVNCServer did not properly handle Tight encoding gradient filter rectangles. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-44988)

Record
USN-8463-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libvncclient1
TuxCare:Ubuntu:18.04
From an advisory covering 2 CVEs
 before 0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
libvncserver-config
TuxCare:Ubuntu:18.04
From an advisory covering 2 CVEs
 before 0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
libvncserver-dev
TuxCare:Ubuntu:18.04
From an advisory covering 2 CVEs
 before 0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
libvncserver1
TuxCare:Ubuntu:18.04
From an advisory covering 2 CVEs
 before 0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
0.9.11+dfsg-1ubuntu1.4+tuxcare.els1
libvncserver
Debian:12
 before 0.9.14+dfsg-1+deb12u1, plus listed versions
0.9.14+dfsg-1
0.9.14+dfsg-1+deb12u1
libvncserver
Debian:13
 before 0.9.15+dfsg-1+deb13u1, plus listed versions
0.9.15+dfsg-1
0.9.15+dfsg-1+deb13u1
libvncserver
Debian:14
 before 0.9.15+dfsg-3, plus listed versions
0.9.15+dfsg-10.9.15+dfsg-2
0.9.15+dfsg-3
libvncserver
Mageia:10
From an advisory covering 4 CVEs
 before 0.9.15-2.1.mga10
0.9.15-2.1.mga10
libvncserver
Mageia:9
From an advisory covering 4 CVEs
 before 0.9.14-1.1.mga9
0.9.14-1.1.mga9
libvncserver
openEuler:24.03-LTS
From an advisory covering 2 CVEs
 before 0.9.13-4.oe2403
0.9.13-4.oe2403
Show 55 moreShow less
Affected packages
PackageAffectedFixed
libvncserver
openEuler:24.03-LTS-SP1
From an advisory covering 2 CVEs
 before 0.9.13-4.oe2403sp1
0.9.13-4.oe2403sp1
libvncserver
openEuler:24.03-LTS-SP3
From an advisory covering 2 CVEs
 before 0.9.13-4.oe2403sp3
0.9.13-4.oe2403sp3
libvncserver
openEuler:22.03-LTS-SP4
From an advisory covering 2 CVEs
 before 0.9.13-4.oe2203sp4
0.9.13-4.oe2203sp4
LibVNCServer
SUSE:Linux Enterprise Module for Package Hub 15 SP7
From an advisory covering 2 CVEs
 before 0.9.10-150000.4.35.1
0.9.10-150000.4.35.1
LibVNCServer
SUSE:Linux Enterprise Module for Package Hub 15 SP7
From an advisory covering 2 CVEs
 before 0.9.14-150600.3.6.1
0.9.14-150600.3.6.1
LibVNCServer
SUSE:Linux Enterprise Workstation Extension 15 SP7
From an advisory covering 2 CVEs
 before 0.9.14-150600.3.6.1
0.9.14-150600.3.6.1
LibVNCServer
openSUSE:Leap 15.6
From an advisory covering 2 CVEs
 before 0.9.14-150600.3.6.1
0.9.14-150600.3.6.1
LibVNCServer
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 2 CVEs
 before 0.9.9-17.44.1
0.9.9-17.44.1
LibVNCServer
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 2 CVEs
 before 0.9.9-17.44.1
0.9.9-17.44.1
LibVNCServer
SUSE:Linux Enterprise Server 16.0
From an advisory covering 2 CVEs
 before 0.9.14-160000.4.1
0.9.14-160000.4.1
LibVNCServer
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 2 CVEs
 before 0.9.14-160000.4.1
0.9.14-160000.4.1
tightvnc
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.3.9-6.41.3.9-6.4ubuntu11.3.9-6.5+deb8u1build0.14.04.1~esm1
 None known
x11vnc
Ubuntu:14.04:LTS
 All versions, plus listed versions
0.9.13-1.1
 None known
libvncserver
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.9.10+dfsg-30.9.10+dfsg-3build10.9.10+dfsg-3ubuntu0.16.04.10.9.10+dfsg-3ubuntu0.16.04.20.9.10+dfsg-3ubuntu0.16.04.30.9.10+dfsg-3ubuntu0.16.04.40.9.10+dfsg-3ubuntu0.16.04.50.9.10+dfsg-3ubuntu0.16.04.6
 None known
vino
Ubuntu:16.04:LTS
 All versions, plus listed versions
3.8.1-0ubuntu63.8.1-0ubuntu73.8.1-0ubuntu83.8.1-0ubuntu93.8.1-0ubuntu9.13.8.1-0ubuntu9.23.8.1-0ubuntu9.33.8.1-0ubuntu9.4
 None known
italc
Ubuntu:16.04:LTS
 All versions, plus listed versions
1:2.0.2+dfsg1-31:2.0.2+dfsg1-41:2.0.2+dfsg1-4ubuntu0.1
 None known
tightvnc
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.3.10-0ubuntu21.3.10-0ubuntu3
 None known
x11vnc
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
0.9.13-1.2build10.9.13-1.2ubuntu0.1~esm1
 None known
libvncserver
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.9.11+dfsg-10.9.11+dfsg-1ubuntu10.9.11+dfsg-1ubuntu1.10.9.11+dfsg-1ubuntu1.20.9.11+dfsg-1ubuntu1.30.9.11+dfsg-1ubuntu1.4
 None known
vino
Ubuntu:18.04:LTS
 All versions, plus listed versions
3.8.1-0ubuntu123.22.0-2ubuntu13.22.0-3ubuntu13.22.0-3ubuntu1.13.22.0-3ubuntu1.2
 None known
italc
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:3.0.3+dfsg1-11:3.0.3+dfsg1-21:3.0.3+dfsg1-2build11:3.0.3+dfsg1-2ubuntu11:3.0.3+dfsg1-31:3.0.3+dfsg1-3ubuntu0.1
 None known
tightvnc
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.3.10-0ubuntu31.3.10-0ubuntu4
 None known
x11vnc
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
0.9.13-20.9.13-2build10.9.13-30.9.13-3ubuntu0.1~esm1
 None known
libvncserver
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.9.11+dfsg-1.30.9.12+dfsg-3ubuntu30.9.12+dfsg-60.9.12+dfsg-70.9.12+dfsg-8
Show 4 moreShow less
0.9.12+dfsg-90.9.12+dfsg-9ubuntu0.10.9.12+dfsg-9ubuntu0.20.9.12+dfsg-9ubuntu0.3
 None known
vino
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.22.0-5ubuntu23.22.0-5ubuntu2.13.22.0-5ubuntu2.2
 None known
tightvnc
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.3.10-0ubuntu5
 None known
veyon
Ubuntu:20.04:LTS
 All versions, plus listed versions
4.2.4+repack1-24.2.5+repack1-14.3.1+repack1-14.3.1+repack1-24.3.1+repack1-2build14.3.1+repack1-2build2
 None known
x11vnc
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
0.9.13-60.9.16-30.9.16-3ubuntu0.1~esm1
 None known
libvncserver
Ubuntu:22.04:LTS
 before 0.9.13+dfsg-3ubuntu0.1, plus listed versions
0.9.13+dfsg-30.9.13+dfsg-3build10.9.13+dfsg-3build2
0.9.13+dfsg-3ubuntu0.1
tightvnc
Ubuntu:22.04:LTS
 All versions, plus listed versions
1:1.3.10-31:1.3.10-5
 None known
veyon
Ubuntu:22.04:LTS
 All versions, plus listed versions
4.5.3+repack1-1build14.5.3+repack1-1build2
 None known
vino
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.22.0-6ubuntu3
 None known
x11vnc
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.9.16-70.9.16-7build10.9.16-8
 None known
libvncserver
Ubuntu:24.04:LTS
 before 0.9.14+dfsg-1ubuntu0.1, plus listed versions
0.9.14+dfsg-10.9.14+dfsg-1build10.9.14+dfsg-1build2
0.9.14+dfsg-1ubuntu0.1
tightvnc
Ubuntu:24.04:LTS
 All versions, plus listed versions
1:1.3.10-71:1.3.10-7build11:1.3.10-7build21:1.3.10-8
 None known
veyon
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.7.5+repack1-1build24.7.5+repack1-1ubuntu14.7.5+repack1-1ubuntu34.7.5+repack1-1ubuntu44.7.5+repack1-1ubuntu5
 None known
vino
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.22.0-6ubuntu33.22.0-6ubuntu43.22.0-6ubuntu5
 None known
x11vnc
Ubuntu:24.04:LTS
 All versions, plus listed versions
0.9.16-90.9.16-9ubuntu10.9.16-10
 None known
libvncserver
Ubuntu:25.10
 before 0.9.15+dfsg-1ubuntu0.1, plus listed versions
0.9.14+dfsg-1build20.9.15+dfsg-1
0.9.15+dfsg-1ubuntu0.1
tightvnc
Ubuntu:25.10
 All versions, plus listed versions
1:1.3.10-91:1.3.10-10
 None known
veyon
Ubuntu:25.10
 All versions, plus listed versions
4.7.5+repack1-1ubuntu64.7.5+repack1-1ubuntu74.9.7+repack1-1
 None known
vino
Ubuntu:25.10
 All versions, plus listed versions
3.22.0-7ubuntu1
 None known
x11vnc
Ubuntu:25.10
 All versions, plus listed versions
0.9.16-100.9.17-1
 None known
tightvnc
Ubuntu:26.10
 All versions, plus listed versions
1:1.3.10-10build11:1.3.10-11
 None known
veyon
Ubuntu:26.10
 All versions, plus listed versions
4.9.7+repack1-1build14.9.7+repack1-1.14.9.7+repack1-1.1build14.9.7+repack1-1.1build2
 None known
x11vnc
Ubuntu:26.10
 All versions, plus listed versions
0.9.17-20.9.17-30.9.17-3build1
 None known
tightvnc
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:1.3.10-101:1.3.10-10build1
 None known
veyon
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.9.7+repack1-14.9.7+repack1-1build1
 None known
x11vnc
Ubuntu:26.04:LTS
 All versions, plus listed versions
0.9.17-10.9.17-2
 None known
libvncserver
Ubuntu:22.04:LTS
From an advisory covering 4 CVEs
 before 0.9.13+dfsg-3ubuntu0.1, plus listed versions
0.9.13+dfsg-30.9.13+dfsg-3build10.9.13+dfsg-3build2
0.9.13+dfsg-3ubuntu0.1
libvncserver
Ubuntu:24.04:LTS
From an advisory covering 4 CVEs
 before 0.9.14+dfsg-1ubuntu0.1, plus listed versions
0.9.14+dfsg-10.9.14+dfsg-1build10.9.14+dfsg-1build2
0.9.14+dfsg-1ubuntu0.1
libvncserver
Ubuntu:25.10
From an advisory covering 4 CVEs
 before 0.9.15+dfsg-1ubuntu0.1, plus listed versions
0.9.14+dfsg-1build20.9.15+dfsg-1
0.9.15+dfsg-1ubuntu0.1
libvncserver
Ubuntu:26.04:LTS
From an advisory covering 4 CVEs
 before 0.9.15+dfsg-3ubuntu0.1, plus listed versions
0.9.15+dfsg-10.9.15+dfsg-20.9.15+dfsg-3
0.9.15+dfsg-3ubuntu0.1
LibVNCServer
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 0.9.15-2.1
0.9.15-2.1
LibVNCServer
openSUSE:Leap 16.0
From an advisory covering 2 CVEs
 before 0.9.14-160000.4.1
0.9.14-160000.4.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-32853 is a medium vulnerability (CVSS 6.9) in Libvnc Libvncserver, published March 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 38th percentile. Fixed in libvncserver 0.9.14+dfsg-1+deb12u1.

References

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