HOMEVULNERABILITIESCVE-2026-32853
HIGH

CVE-2026-32853

CWE-125Published: March 24, 2026· Updated: Mar 25, 2026

8.1
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official Description

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

NVD Source

Technical Analysis

CVE-2026-32853 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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/009008e2f4d5a54dd71f422070df3af7b3dbc931
ADVISORYhttps://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
ADVISORYhttps://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read
ADVISORYhttps://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj

All References (4)

→
https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931Patch
→
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcjVendor Advisory
→
https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-readExploit · Vendor Advisory
→
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcjVendor Advisory

Quick Facts

CVE IDCVE-2026-32853
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 24, 2026

Related CVEs (CWE-125)

CVE-2026-34987
9.9
CVE-2026-42799
9.8
CVE-2025-15646
9.8
CVE-2026-33642
9.8
CVE-2026-24213
9.8
CVE-2026-6920
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-32853 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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