CVE-2026-62377

libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF sequence accepted by heif_context_read_from_memory() can leave the context with no registered sequence tracks and crash when heif_context_get_track(ctx, 0) is called. HeifContext::get_track() in libheif/context.cc executes assert(has_sequence()) before its normal error handling, so assert-enabled builds abort instead of allowing the public wrapper in libheif/api/libheif/heif_sequences.cc to return null. In release builds, removing the assertion lets the track_id zero path dereference m_tracks.begin()->second on an empty map, which is undefined behavior and typically crashes. The issue is reachable through documented public APIs after parsing attacker-controlled bytes. This issue is fixed in version 1.23.1.

These are all security issues fixed in the gdk-pixbuf-loader-libheif-1.23.1-1.1 package on the GA media of openSUSE Tumbleweed.

This update for libheif fixes the following issues:

Update to version 1.23.1 (jsc#PED-16355).

Security issues fixed:

• CVE-2026-62289: integer underflow in Fraction constructor via double clap transform application (bsc#1273079).
• CVE-2026-62291: heap out-of-bounds write in the uncompressed encoder when writing images with mismatched auxiliary alpha dimensions (bsc#1273080).
• CVE-2026-62292: out-of-bounds read in uncompressed unci tile range slicing (bsc#1273081).
• CVE-2026-62377: reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF sequence file (bsc#1273082).
• Heap out-of-bounds write in the uncompressed encoder for RRGGBB images with interleaved bit-depth <= 8 (bsc#1273083).

Changes for libheif:

• Version 1.23.1
  • FFmpeg decoder plugin gains AV1, VVC, JPEG, and JPEG 2000/HTJ2K decoding.
  • SVT-AV1 encoder: new tune=iq and ms-ssim tune parameters.
  • C++ API: added getters/setters for the CLLI and MDCV HDR metadata boxes.
  • Sequence decoder now scales the alpha auxiliary track to the main image size.
  • Fixed pixi box writing for multi-channel images.
  • Corrected the placement of the TAI clock_type field into the top 2 bits.
  • Empty/unset plugin directory is no longer scanned.

This update for libheif fixes the following issues:

Update to version 1.23.1 (jsc#PED-16355).

Security issues fixed:

• CVE-2026-62289: integer underflow in Fraction constructor via double clap transform application (bsc#1273079).
• CVE-2026-62291: heap out-of-bounds write in the uncompressed encoder when writing images with mismatched auxiliary alpha dimensions (bsc#1273080).
• CVE-2026-62292: out-of-bounds read in uncompressed unci tile range slicing (bsc#1273081).
• CVE-2026-62377: reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF sequence file (bsc#1273082).
• Heap out-of-bounds write in the uncompressed encoder for RRGGBB images with interleaved bit-depth <= 8 (bsc#1273083).

Changes for libheif:

• Version 1.23.1
  • FFmpeg decoder plugin gains AV1, VVC, JPEG, and JPEG 2000/HTJ2K decoding.
  • SVT-AV1 encoder: new tune=iq and ms-ssim tune parameters.
  • C++ API: added getters/setters for the CLLI and MDCV HDR metadata boxes.
  • Sequence decoder now scales the alpha auxiliary track to the main image size.
  • Fixed pixi box writing for multi-channel images.
  • Corrected the placement of the TAI clock_type field into the top 2 bits.
  • Empty/unset plugin directory is no longer scanned.

This update for libheif fixes the following issues:

Update to version 1.23.1 (jsc#PED-16355).

Security issues fixed:

• CVE-2026-62289: integer underflow in Fraction constructor via double clap transform application (bsc#1273079).
• CVE-2026-62291: heap out-of-bounds write in the uncompressed encoder when writing images with mismatched auxiliary alpha dimensions (bsc#1273080).
• CVE-2026-62292: out-of-bounds read in uncompressed unci tile range slicing (bsc#1273081).
• CVE-2026-62377: reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF sequence file (bsc#1273082).
• Heap out-of-bounds write in the uncompressed encoder for RRGGBB images with interleaved bit-depth <= 8 (bsc#1273083).

Changes for libheif:

• Version 1.23.1
  • FFmpeg decoder plugin gains AV1, VVC, JPEG, and JPEG 2000/HTJ2K decoding.
  • SVT-AV1 encoder: new tune=iq and ms-ssim tune parameters.
  • C++ API: added getters/setters for the CLLI and MDCV HDR metadata boxes.
  • Sequence decoder now scales the alpha auxiliary track to the main image size.
  • Fixed pixi box writing for multi-channel images.
  • Corrected the placement of the TAI clock_type field into the top 2 bits.
  • Empty/unset plugin directory is no longer scanned.

Ali Firas discovered that libheif incorrectly handled certain images. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-62291)

Dmitrijs Trizna discovered that libheif incorrectly handled certain image sequences. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-62377)