Medium 6.3Published Mar 24, 2026

CVE-2026-32854LibVNCServer httpd proxy NULL Pointer Dereference

Updated under an hour ago (Oct 27, 2026, 9:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

LibVNC LibVNCServer libvnc:libvncserver (from the name)	through 0.9.15; dc78dee51a7e270e537a541a17befdf2073f5314 not affected	CNA record
libvncserver_project libvncserver libvncserver_project:libvncserver	before 0.9.15	NVD

References

References

https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x	vendor-advisory, exploit
https://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf2073f5314	patch
https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.