# CVE-2026-32854: libvncserver: LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in...

CVE-2026-32854 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-32854, released March 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-32854
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0542
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 24, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | LibVNCServer opensuse-leap 15.6 | 0.9.14-150600.3.6.1 | [SUSE-SU-2026:1173-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1173-1.md) | Apr 2, 2026 |
| Linux | LibVNCServer opensuse-leap 16.0 | 0.9.14-160000.4.1 | [OPENSUSE-SU-2026:20552-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20552-1.md) | Apr 16, 2026 |
| Linux | LibVNCServer sles 15.7 | 0.9.14-150600.3.6.1 | [SUSE-SU-2026:1173-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1173-1.md) | Apr 2, 2026 |
| Linux | LibVNCServer sles 16.0 | 0.9.14-160000.4.1 | [SUSE-SU-2026:21206-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-21206-1.md) | Apr 16, 2026 |
| Linux | libvncclient1 Ubuntu 22.04.1 LTS (jammy) | 0.9.13+dfsg-3ubuntu0.1 | [libvncclient1 0.9.13+dfsg-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libvncclient1-0.9.13-dfsg-3ubuntu0.1.md) | Jun 24, 2026 |
| Linux | libvncclient1 Ubuntu 24.04.5 LTS (noble) | 0.9.14+dfsg-1ubuntu0.1 | [libvncclient1 0.9.14+dfsg-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libvncclient1-0.9.14-dfsg-1ubuntu0.1.md) | Jun 24, 2026 |
| Linux | libvncclient1 Ubuntu 25.10 (questing) | 0.9.15+dfsg-1ubuntu0.1 | [libvncclient1 0.9.15+dfsg-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libvncclient1-0.9.15-dfsg-1ubuntu0.1.md) | Jun 24, 2026 |
| Linux | libvncserver Debian 12.15 (bookworm) | 0.9.14+dfsg-1+deb12u1 | [DEBIAN-CVE-2026-32854](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32854.md) | Mar 24, 2026 |
| Linux | libvncserver Debian 13.5 (trixie) | 0.9.15+dfsg-1+deb13u1 | [DEBIAN-CVE-2026-32854](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32854.md) | Mar 24, 2026 |
| Linux | libvncserver Debian 14 | 0.9.15+dfsg-3 | [DEBIAN-CVE-2026-32854](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32854.md) | Mar 24, 2026 |
| Linux | libvncserver1 Ubuntu 22.04.1 LTS (jammy) | 0.9.13+dfsg-3ubuntu0.1 | [libvncserver1 0.9.13+dfsg-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libvncserver1-0.9.13-dfsg-3ubuntu0.1.md) | Jun 24, 2026 |
| Linux | libvncserver1 Ubuntu 24.04.5 LTS (noble) | 0.9.14+dfsg-1ubuntu0.1 | [libvncserver1 0.9.14+dfsg-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libvncserver1-0.9.14-dfsg-1ubuntu0.1.md) | Jun 24, 2026 |
| Linux | libvncserver1 Ubuntu 25.10 (questing) | 0.9.15+dfsg-1ubuntu0.1 | [libvncserver1 0.9.15+dfsg-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libvncserver1-0.9.15-dfsg-1ubuntu0.1.md) | Jun 24, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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