Is CVE-2026-121517 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121517?

CVE-2026-121517 has a CVSS v3 severity of MEDIUM (5).

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CVE-2026-121517

Description

A vulnerability was detected in IrfanView 4.76.0.0 on Win64. Affected by this vulnerability is an unknown functionality of the component TIFF Wang Annotation Handler. Performing a manipulation results in heap-based buffer overflow. The attack is possible to be carried out remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit is now public and may be used. It is recommended to apply a patch to fix this issue. The vendor confirms: "[T]he TIF-Annotations option is OFF by default. Means, normal users are not affected ... the danger level for this is low".