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Vulnerability Details :

CVE-2026-32853

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-24 Mar, 2026 | 17:30
Updated At-25 Mar, 2026 | 13:41
Rejected At-
Credits

LibVNCServer UltraZip Encoding Heap Out-of-bounds Read

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:24 Mar, 2026 | 17:30
Updated At:25 Mar, 2026 | 13:41
Rejected At:
▼CVE Numbering Authority (CNA)
LibVNCServer UltraZip Encoding Heap Out-of-bounds Read

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.

Affected Products
Vendor
LibVNC
Product
LibVNCServer
Repo
https://github.com/LibVNC/libvncserver
Default Status
unaffected
Versions
Affected
  • From 0 through 0.9.15 (semver)
Unaffected
  • 009008e2f4d5a54dd71f422070df3af7b3dbc931 (git)
Problem Types
TypeCWE IDDescription
CWECWE-125CWE-125 Out-of-bounds read
Type: CWE
CWE ID: CWE-125
Description: CWE-125 Out-of-bounds read
Metrics
VersionBase scoreBase severityVector
4.06.9MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Version: 4.0
Base score: 6.9
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

finder
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
vendor-advisory
https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931
patch
https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read
third-party-advisory
Hyperlink: https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
Resource:
vendor-advisory
Hyperlink: https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931
Resource:
patch
Hyperlink: https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
exploit
Hyperlink: https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:24 Mar, 2026 | 18:16
Updated At:25 Mar, 2026 | 20:48

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.9MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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
Primary3.18.1HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Type: Secondary
Version: 4.0
Base score: 6.9
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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
Type: Primary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
CPE Matches

libvncserver_project
libvncserver_project
>>libvncserver>>Versions before 0.9.15(exclusive)
cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-125Secondarydisclosure@vulncheck.com
CWE ID: CWE-125
Type: Secondary
Source: disclosure@vulncheck.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931disclosure@vulncheck.com
Patch
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcjdisclosure@vulncheck.com
Vendor Advisory
https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-readdisclosure@vulncheck.com
Exploit
Vendor Advisory
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj134c704f-9b21-4f2e-91b3-4a467353bcc0
Vendor Advisory
Hyperlink: https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931
Source: disclosure@vulncheck.com
Resource:
Patch
Hyperlink: https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
Source: disclosure@vulncheck.com
Resource:
Vendor Advisory
Hyperlink: https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read
Source: disclosure@vulncheck.com
Resource:
Exploit
Vendor Advisory
Hyperlink: https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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