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.
Published:
2026-11-13
Score:
n/a
EPSS:
n/a
KEV:
No
Impact:
n/a
Action:
n/a
Analysis
No analysis available yet.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| UltraVNC | UltraVNC | affected |
|
||||||
| Glavsoft (TightVNC) | TightVNC | affected |
|
No data.
No data.
No data available yet.
Remediation
No remediation available yet.
Tracking
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Advisories
No advisories yet.
References
| Link | Providers |
|---|---|
| https://github.com/ultravnc/ultravnc |
|
| https://www.tightvnc.com/ |
|
History
Fri, 13 Nov 2026 00:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow vulnerability | |
| References |
|
Subscriptions
No data.
MITRE
Status: PUBLISHED
Assigner: certcc
Published:
Updated: 2026-11-13T00:08:32.021Z
Reserved: 2026-11-13T00:02:00.631Z
Link: CVE-2026-128321
Vulnrichment
No data.
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.