strukturag libheif up to 1.23.1 Decompression interpret_heif_file_images buffer overflow

Summaryinfo

A vulnerability identified as problematic has been detected in strukturag libheif up to 1.23.1. Impacted is the function HeifContext::interpret_heif_file_images of the component Decompression. Performing a manipulation results in buffer overflow. This vulnerability is reported as CVE-2026-84384. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in strukturag libheif up to 1.23.1. This affects the function HeifContext::interpret_heif_file_images of the component Decompression. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on availability. The summary by CVE is:

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective size limit or MemoryHandle accounting. The brotli path has no output bound, while the zlib path checks only a small temporary buffer in a branch that valid streams do not reach, and overlapping icef units can decompress the same payload repeatedly. HeifContext::interpret_heif_file_images() processes multiple compressed metadata items during file opening, allowing a small file to consume unbounded memory and terminate the process. This issue is fixed in version 1.23.2.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-84384 since 09/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, 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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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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