HOMEVULNERABILITIESCVE-2026-32854
HIGH

CVE-2026-32854

CWE-476Published: March 24, 2026· Updated: Mar 25, 2026

7.5
CVSS v3.1
EPSS:0.28%probability of exploitation in 30 daysPercentile:51.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-32854 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

libvncserver_project1 product
libvncserver
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf2073f5314
ADVISORYhttps://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x
ADVISORYhttps://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference

All References (3)

→
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

Quick Facts

CVE IDCVE-2026-32854
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-476
CISA KEVNo
EPSS (30d)0.28%
Affected1 vendor
PublishedMar 24, 2026

Related CVEs (CWE-476)

CVE-2026-33063
8.7
CVE-2026-13084
8.7
CVE-2026-28224
8.2
CVE-2026-31792
7.8
CVE-2025-59606
7.8
CVE-2025-59604
7.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-32854 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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