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CVE-2026-32854— LibVNCServer httpd proxy NULL Pointer Dereference

Quick assessment

Affected
LibVNC LibVNCServer
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibVNCServer是一款支持在程序中实现VNC（虚拟网络计算）服务器或客户端功能的跨平台C语言库。 LibVNCServer 0.9.15及之前版本存在代码问题漏洞，该漏洞源于HTTP代理处理程序中存在空指针取消引用，可能导致拒绝服务。

CVSS 6.3 · Medium EPSS 5.42% · P93

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
LibVNC LibVNCServer ≤ 0.9.15 affected
dc78dee51a7e270e537a541a17befdf2073f5314 unaffected
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I. Basic Information for CVE-2026-32854

Vulnerability Information
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Vulnerability Title
LibVNCServer httpd proxy NULL Pointer Dereference
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
LibVNCServer 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibVNCServer是一款支持在程序中实现VNC（虚拟网络计算）服务器或客户端功能的跨平台C语言库。 LibVNCServer 0.9.15及之前版本存在代码问题漏洞，该漏洞源于HTTP代理处理程序中存在空指针取消引用，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LibVNC LibVNCServer 0 ~ 0.9.15 -

II. Public POCs for CVE-2026-32854

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III. Intelligence Information for CVE-2026-32854

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Patches & Fixes for CVE-2026-32854 (1)

Vendor Advisories for CVE-2026-32854 (2)

IV. Related Vulnerabilities

Same product: LibVNCServer
Same vendor: LibVNC
Same weakness: CWE-476