strukturag libheif up to 1.22.x stsz Box Parser seq_boxes.cc Box_stsz::parse memory allocation

Summaryinfo

A vulnerability categorized as problematic has been discovered in strukturag libheif up to 1.22.x. Affected is the function Box_stsz::parse of the file libheif/sequences/seq_boxes.cc of the component stsz Box Parser. Executing a manipulation can lead to memory allocation. This vulnerability is registered as CVE-2026-50142. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in strukturag libheif up to 1.22.x. This vulnerability affects the function Box_stsz::parse of the file libheif/sequences/seq_boxes.cc of the component stsz Box Parser. 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. From 1.19.0 until 1.23.0, a crafted HEIF sequence accepted by heif_context_read_from_memory() with the msf1 sequence brand can cause unbounded heap allocation. In libheif/sequences/seq_boxes.cc, Box_stsz::parse() applies max_sequence_frames only to variable-size samples, so fixed-size mode accepts an attacker-controlled sample_count without a bound. In libheif/sequences/track.cc, Track::load() also adds current_sample_idx and samples_per_chunk in 32-bit arithmetic, allowing the consistency check to be bypassed by wraparound. The resulting values reach the Chunk::Chunk() allocation path, which can consume gigabytes of memory and crash or stall the process through memory exhaustion. This issue is fixed in version 1.23.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-50142 since 06/03/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 1.23.0 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22

Website

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

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