SUSE-SU-2026:4378-1

This update for libheif fixes the following issues:

• AV1/libaom path allows allocation before libheif rejects mismatched coded dimensions (bsc#1281953).
• Caller-configured security limits not enforced for MINI-box parsing (bsc#1281952).
• Heap out-of-bounds read in libheif alpha compositing via mismatched per-channel bit depths (bsc#1281951).
• Heap-use-after-free and double free in ImageItem::encode_to_bitstream_and_boxes (bsc#1281949).
• Incomplete OpenJPEG pre-decode security limits allow unsafe decode through the public API (bsc#1281954).
• JPEG 2000 pclr zero-column allocation amplification bypasses max_total_memory (bsc#1281950).
• Out-of-bounds heap read in unc_encoder_rgb_pixel_interleave (bsc#1281948).

Changes for libheif:

Update to 1.23.5:

• (GHSA-v8qw-hwjv-44hw) Memory exhaustion through a mismatch between the container and the bitstream image size. A crafted image can declare a small size in its ispe property while the bitstream declares a much larger coded frame. The container-level checks used the ispe size, so the oversized bitstream reached the decoder, which allocated a frame buffer for the in-band size before libheif rejected the mismatch. The advisory demonstrated this for AV1 with the libaom backend (a 351-byte AVIF declaring 64x64 but coding up to 27648x27648, allocating hundreds of MB to more than 10 GB), but the same class affects every codec whose real frame size lives in the bitstream. The coded size is now checked against max_image_size_pixels in the codec- independent decode path, before any bytes reach a decoder plugin: all AV1 sequence headers, all HEVC/AVC/VVC SPS NAL units (including those carried in the item data, not only the ones in the configuration record), the JPEG SOF marker and the JPEG 2000 SIZ reference grid are scanned for the largest coded size. (high)
• (GHSA-qwpf-5wf7-r996) Heap use-after-free and double free when encoding an image that carries a TAI timestamp, including transcoding a file with an itai property. ImageDescription shallow-copied its raw heif_tai_timestamp_packet pointer, and a temporary in ImageItem::encode_to_bitstream_and_boxes() freed the packet while the item and the source image still held it. The timestamp is now stored by value. (medium)
• (GHSA-9c75-9g8r-4728) Memory amplification through a JPEG 2000 pclr box declaring zero palette columns. The entry-count bound was skipped for zero columns, so an 11-byte box allocated 65,535 empty palette entries, and nested j2kH containers could repeat this within the child and nesting limits: a 3 KB file reached about 330 MB RSS, none of it charged to max_total_memory. Zero columns are rejected (ISO/IEC 15444-1 requires 1 to 255), the byte bound is unconditional, and the palette storage is charged to the memory limits. (medium)
• (GHSA-r7gr-2xm2-23wf) Heap out-of-bounds read in alpha compositing for uncompressed (unci) images whose colour planes have different bit depths. Op_flatten_alpha_plane read every plane through the sample type of the first colour plane, so an 8-bit blue plane next to 16-bit red and green planes was read with a halved stride past its end, and the bytes ended up in the composited output. ColorState now tracks one bit depth per plane, and the operator declines mixed sample widths at planning time. (medium)
• (GHSA-q492-cfcm-895h) The OpenJPEG decoder plugin's pre-decode size check bounded the JPEG 2000 window span (x1-x0)*(y1-y0) but not the absolute reference-grid coordinates, so a codestream with a 17-pixel window on a grid near the 32-bit boundary reached opj_decode(). Against OpenJPEG 2.3.1 this produced a heap-buffer-overflow write inside OpenJPEG (the class of CVE-2020-6851); OpenJPEG 2.5.4 rejects the input. The reference-grid area is now bounded as well. (low)
• (GHSA-qfj5-c4pq-q998) Heap out-of-bounds read in the uncompressed encoder when an application attached a separate alpha plane to an image with an interleaved chroma format. The interleaved encoders took their component list from the chroma format (three entries) but decided whether to write alpha from the presence of an alpha plane, and indexed the list at [3]. heif_image_add_plane() now rejects a separate alpha plane on interleaved images, and the encoders derive both decisions from the chroma format. Only reachable through the public API; decoding never produces such an image. (low)
• (GHSA-7pwf-qh74-p35w) The caller's heif_security_limits were not applied when parsing a mini box (the MIAF minimized image format) or the av1C/hvcC blob embedded in it; the built-in defaults were used instead. An application that tightened the limits got no enforcement of its max_memory_block_size or max_total_memory on such files. The allocations are bounded by the bytes present in the box, so this could not amplify memory use. (low)