strukturag libheif up to 1.19.5 Color Conversion rgb2yuv.cc convert_colorspace integer overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in strukturag libheif up to 1.19.5. The affected element is the function Op_RGB24_32_to_YCbCr::convert_colorspace of the file libheif/color-conversion/rgb2yuv.cc of the component Color Conversion. This manipulation causes integer overflow. This vulnerability is handled as CVE-2026-84449. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in strukturag libheif up to 1.19.5. Affected by this vulnerability is the function Op_RGB24_32_to_YCbCr::convert_colorspace of the file libheif/color-conversion/rgb2yuv.cc of the component Color Conversion. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-84449 since 09/01/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.19.6 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.19.0
• 1.19.1
• 1.19.2
• 1.19.3
• 1.19.4
• 1.19.5

Website

• Product: https://github.com/strukturag/libheif/

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