CVE-2026-32854

Name: CVE-2026-32854
Creator: NVD / NIST
Published: 2026-03-24T18:16:09.423+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 5.32%

Last modified Jun 17, 2026

CVE-2026-32854 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. 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.. EPSS estimates a 5.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

6.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

5.32%

91.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Libvncserver Project	Libvncserver	< 0.9.15

References

https://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf2073f5314Patch
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4xExploit, Vendor Advisory
https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereferenceThird Party Advisory

Timeline

Published: Mar 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-32854?

How severe is CVE-2026-32854?

CVE-2026-32854 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 5.32% probability of exploitation in the next 30 days.

How do I fix CVE-2026-32854?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-32854?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST