CVE-2026-41071
HighSummary
In versions 1.21.2 and prior, the libheif library has a heap-buffer-overflow vulnerability in the SampleAuxInfoReader constructor caused by an incorrect declaration of the number of samples in a HEIF file. During file parsing, the number of samples may exceed the number of available chunks, leading to out-of-bounds read.
Risk Assessment
Organizations using libheif to open untrusted HEIF files are at risk of potential attacks that could lead to unauthorized memory access and execution of malicious code.
Recommendation
It is recommended to update the libheif library to version 1.22.0 or later to mitigate this vulnerability. Additionally, avoid opening untrusted HEIF files.
Original NVD description (English source)
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a crafted HEIF sequence file where the saiz box declares more samples than actually exist in the track's chunk table causes a heap-buffer-overflow (out-of-bounds read) in the SampleAuxInfoReader constructor. The SampleAuxInfoReader constructor iterates over saiz->get_num_samples() samples but doesn't validate that this count is consistent with the number of chunks in the chunks vector. When saiz declares more samples than the chunks cover, the loop increments current_chunk past chunks.size(), causing an out-of-bounds read on the chunks vector. The vulnerability is triggered during file parsing (heif_context_read_from_file) without any additional user interaction. Any application using libheif to open untrusted HEIF files is affected. This issue has been fixed in version 1.22.0.