UBUNTU-CVE-2026-84446

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2.

References

Affected packages

Ubuntu:26.04:LTS / libheif

Package

Name: libheif
Purl: pkg:deb/ubuntu/libheif?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.21.2-3ubuntu0.6

Affected versions

1.*

1.20.2-1

1.20.2-2

1.20.2-2build1

1.20.2-2build2

1.20.2-2ubuntu1

1.21.2-1

1.21.2-3

1.21.2-3ubuntu0.1

1.21.2-3ubuntu0.2

1.21.2-3ubuntu0.3

1.21.2-3ubuntu0.4

1.21.2-3ubuntu0.5

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "heif-gdk-pixbuf",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "heif-thumbnailer",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "heif-view",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-examples",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-aomdec",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-aomenc",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-dav1d",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-ffmpegdec",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-j2kdec",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-j2kenc",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-jpegdec",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-jpegenc",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-kvazaar",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-libde265",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-rav1e",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-svtenc",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugin-x265",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif-plugins-all",
            "binary_version": "1.21.2-3ubuntu0.6"
        },
        {
            "binary_name": "libheif1",
            "binary_version": "1.21.2-3ubuntu0.6"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84446.json"