CVE-2026-32854

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/24/2026

Last Modified3/25/2026

Sourcenvd

Honeypot Sightings0

Affected Products

libvncserver_project:libvncserver

Weaknesses (CWE)

CWE-476

References

https://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf2073f5314(disclosure@vulncheck.com)

https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference(disclosure@vulncheck.com)

IOC Correlations

No correlations recorded

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