Skip to content
Fencer Vulns
high 7.5

CVE-2026-32854 json

LibVNCServer httpd proxy NULL Pointer Dereference

published 2026-03-24 7 mo ago modified 2026-11-08 26 h ago also EUVD-2026-14932

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.4%
EPSS 5.4% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • libvncserver_project libvncserver 0.9.15
  • libvncserver Debian 12 0.9.14+dfsg-1+deb12u1
  • libvncserver Debian 13 0.9.15+dfsg-1+deb13u1
  • libvncserver Debian 14 0.9.15+dfsg-3

debian advisories DEBIAN-CVE-2026-32854

  • libvncserver Ubuntu 22.04 LTS 0.9.13+dfsg-3ubuntu0.1
  • libvncserver Ubuntu 24.04 LTS 0.9.14+dfsg-1ubuntu0.1
  • libvncserver Ubuntu 25.10 0.9.15+dfsg-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-32854

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • LibVNCServer SLES for SAP applications 16.0, SLES 16.0 0.9.14-160000.4.1
  • LibVNCServer SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7, openSUSE Leap 15.6 0.9.14-150600.3.6.1
  • LibVNCServer SLE Module for Package Hub 15 SP7 0.9.10-150000.4.35.1
  • LibVNCServer SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.9.9-17.44.1

suse advisories SUSE-SU-2026:21206-1SUSE-SU-2026:1174-1SUSE-SU-2026:1173-1SUSE-SU-2026:1124-1

  • LibVNCServer openSUSE Leap 16.0 0.9.14-160000.4.1
  • LibVNCServer openSUSE Tumbleweed 0.9.15-2.1

opensuse advisories openSUSE-SU-2026:20552-1openSUSE-SU-2026:10433-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-32854 updated cvss 5.3

LibVNCServer: LibVNCServer: Denial of Service via specially crafted HTTP requests

  • Red Hat Enterprise Linux 6 libvncserver
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 libvncserver
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 gnome-remote-desktop
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 7 libvncserver
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

5.42% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.3 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
CNA 4.0 6.3 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/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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • LibVNC LibVNCServer

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.