Out-of-bounds Read Affecting libheif package, versions <1.23.1-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

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  • Snyk IDSNYK-DEBIANUNSTABLE-LIBHEIF-18584723
  • published8 Aug 2026
  • disclosed18 Aug 2026

Introduced: 8 Aug 2026

NewCVE-2026-62292  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Debian:unstable libheif to version 1.23.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libheif package and not the libheif package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.1, a crafted uncompressed HEIF image using generic zlib unci full-item compression can crash an application that decodes an advertised tile with heif_image_handle_decode_image_tile(). In libheif/codecs/uncompressed/unc_decoder.cc, unc_decoder::fetch_tile_data() computes a large tile offset and unc_decoder::get_compressed_image_data_uncompressed() validates it with range_start_offset plus range_size. For the last advertised tile (4095, 4095), the addition can wrap to zero, bypass the bounds check, and pass an invalid source pointer and a one-terabyte length to memcpy. The observed result is an out-of-bounds read and process crash; opening the file alone does not trigger the issue because tile decoding is required. This issue is fixed in version 1.23.1.

CVSS Base Scores

version 3.1