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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade libvncserver-develUpgrade libvncserver-debuginfoUpgrade libvncserver | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade libvncserver | May 17, 2026 | May 17, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Mar 24, 2026 |
| Ubuntu | — | Upgrade libvncserver1Upgrade libvncclient1 | Jun 24, 2026 | Jun 23, 2026 |
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