PT-2026-27461 · Libvnc · Libvncserver

Published 2026-03-24 · Updated 2026-03-24 · CVE-2026-32854

Mitre

CVSS v4.0

6.3

Medium

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-32854

Affected Products

Libvncserver

References · 4

• https://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf2073f5314 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-32854 · Security Note
• https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x · Vendor Advisory
• https://vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference · Note