Bug 2538504 (CVE-2026-84444)

Summary: CVE-2026-84444 libheif: libheif: Out-of-bounds write allows arbitrary code execution via crafted image tile
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libheif, a HEIF and AVIF file format decoder and encoder. When processing uncompressed tiled images with the `WITH_UNCOMPRESSED_CODEC` enabled, the `heif_context_add_image_tile()` function can accept a specially crafted image tile with mismatched dimensions. This can lead to an out-of-bounds write, allowing an attacker to copy controlled data beyond the heap output buffer, potentially resulting in arbitrary code execution.
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Bug Depends On: 2539258, 2539259    
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Description OSIDB Bzimport 2026-09-22 18:52:58 UTC 
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, when WITH_UNCOMPRESSED_CODEC is enabled, heif_context_add_image_tile() accepts an independently constructed tile whose component-plane dimensions do not match the tile geometry established by the prototype image. ImageItem_uncompressed::add_image_tile() passes that tile directly to unc_encoder::encode_tile(), which lacked the check_component_sizes() gate and sizes its output from the configured tile geometry while copying the tile's actual component-plane dimensions. An oversized component plane can therefore make unc_encoder_component_interleave::encode_tile() copy attacker-controlled data beyond the heap output buffer. This issue is fixed in version 1.23.2.