LibVNC Server up to 0.9.15 HTTP Proxy httpd.c httpProcessInput null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k1.12

Summaryinfo

A vulnerability was found in LibVNC Server up to 0.9.15. It has been declared as problematic. The affected element is the function httpProcessInput of the file httpd.c of the component HTTP Proxy Handler. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-32854. It is possible to launch the attack remotely. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in LibVNC Server up to 0.9.15. Affected by this issue is the function httpProcessInput of the file httpd.c of the component HTTP Proxy Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

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.

The weakness was published by Kazuma Matsumoto. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-32854 since 03/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Applying the patch dc78dee51a7e270e537a541a17befdf2073f5314 is able to eliminate this problem.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: dc78dee51a7e270e537a541a17befdf2073f5314

Timelineinfo

03/16/2026 CVE reserved
03/24/2026 +8 days Advisory disclosed
03/24/2026 +0 days VulDB entry created
03/29/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Researcher: Kazuma Matsumoto
Status: Confirmed

CVE: CVE-2026-32854 (🔒)
GCVE (CVE): GCVE-0-2026-32854
GCVE (VulDB): GCVE-100-352820

Entryinfo

Created: 03/24/2026 18:57
Updated: 03/29/2026 03:20
Changes: 03/24/2026 18:57 (70), 03/29/2026 03:20 (12)
Complete: 🔍
Cache ID: 216:E9A:103

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