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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-128321

Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow vulnerability

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Status
Published
Published
Updated
Assigning organization
certcc

Description

Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow because an attacker-controlled framebuffer rectangle width is not validated against a fixed-size decoding buffer. A malicious VNC server can cause an out-of-bounds heap write when a user connects, resulting in application crash and potentially other memory-corruption impacts.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

UltraVNC UltraVNC

  • 1.8.2.4 to ≤ 1.8.2.6affected

Glavsoft (TightVNC) TightVNC

  • 1.3.10 to ≤ 1.3.10affected

References