strukturag libheif up to 1.23.2 Tiling API Box_clap::left_rounded integer overflow

Summaryinfo

A vulnerability described as problematic has been identified in strukturag libheif up to 1.23.2. This vulnerability affects the function Box_clap::left_rounded of the component Tiling API. Executing a manipulation can lead to integer overflow. This vulnerability appears as CVE-2026-84450. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in strukturag libheif up to 1.23.2. It has been declared as problematic. This vulnerability affects the function Box_clap::left_rounded of the component Tiling API. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. 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 1.23.3, a crafted image item containing a clap property and an ispe width or height greater than INT32_MAX + 1 can reach crop calculations through heif_image_handle_get_image_tiling(). Box_clap::left_rounded() or Box_clap::top_rounded() passes the image dimension minus one to Fraction::Fraction(), whose uint32_t constructor uses an assertion as input validation, causing assert-enabled builds to abort. Release builds can instead compute invalid crop geometry, and the tiling API returns dimensions that the normal decode security limits reject. This issue is fixed in version 1.23.3.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-84450 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. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 1.23.3 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.23.0
• 1.23.1
• 1.23.2

Website

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

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