UBUNTU-CVE-2026-32854

    Dashboard / Vulnerabilities / UBUNTU-CVE-2026-32854

    UBUNTU-CVE-2026-32854

    Published: 24 Mar 2026Last Modified: 23 Jun 2026
    Upstream:
    CVE-2026-32854
    Aliases:
    USN-8463-1

    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.

    References: https://ubuntu.com/security/CVE-2026-32854, https://www.cve.org/CVERecord?id=CVE-2026-32854, https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x, https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference, https://ubuntu.com/security/notices/USN-8463-1

    Affected packages

    Package

    Name: tightvnc

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-32854 | CVE-DB