What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-24 · updated 2026-07-14
• Weakness: CWE-476

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.

Affected products

• LibVNCServer: before 0.9.15 — fixed in 0.9.15

How to fix

Upgrade to a fixed version: LibVNCServer 0.9.15. Check the vendor advisory for mitigations.

References

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

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