strukturag libheif up to 1.23.1 HEIF Decoder init_sample_timing_table memory allocation

Summaryinfo

A vulnerability, which was classified as problematic, was found in strukturag libheif up to 1.23.1. Affected by this issue is the function Track::init_sample_timing_table of the component HEIF Decoder. Executing a manipulation can lead to memory allocation. The identification of this vulnerability is CVE-2026-84446. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in strukturag libheif up to 1.23.1. This vulnerability affects the function Track::init_sample_timing_table of the component HEIF Decoder. The manipulation with an unknown input leads to a memory allocation vulnerability. The CWE definition for the vulnerability is CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-84446 since 09/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 1.23.2 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.23.0
• 1.23.1

Website

• Product: https://github.com/strukturag/libheif/

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