strukturag libheif up to 1.23.2 unc_decoder unc_decoder.cc get_compressed_image_data_uncompressed integer overflow

Summaryinfo

A vulnerability classified as problematic was found in strukturag libheif up to 1.23.2. Impacted is the function unc_decoder::get_compressed_image_data_uncompressed of the file libheif/codecs/uncompressed/unc_decoder.cc of the component unc_decoder. The manipulation results in integer overflow. This vulnerability is known as CVE-2026-84451. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in strukturag libheif up to 1.23.2. Affected is the function unc_decoder::get_compressed_image_data_uncompressed of the file libheif/codecs/uncompressed/unc_decoder.cc of the component unc_decoder. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-84451 since 09/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 1.23.3 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.23.0
• 1.23.1
• 1.23.2

Website

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

CPE 2.3info

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CPE 2.2info

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