CVE-2026-84383

9.8 CRITICALpublic exploit available

Published 2026-09-18 · Updated 2026-09-18

AI risk analysis

Summary: The flaw allows a remote attacker to cause a heap out-of-bounds write by crafting a specific HEIF, HEIC, or AVIF file, potentially leading to arbitrary code execution or data corruption.
Exploitability: Exploitation requires a crafted file and the ability to process it with heif_decode_image(), making it moderately hard to exploit without control over the target system.
Blast radius: If exploited, the issue could lead to data corruption or arbitrary code execution on the affected system, impacting the confidentiality, integrity, and availability of the system's data and services.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to version 1.23.2 or later.

heap-overflowfile-formatdecoder

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

libheif is a HEIF and AVIF file format decoder and encoder. From 1.22.0 until 1.23.2, a crafted HEIF, HEIC, or AVIF item graph using nested iden and auxl references can make HeifPixelImage::transfer_channel_from_image_as() append duplicate Alpha planes with different bit depths to m_storage. HeifPixelImage::scale_nearest_neighbor() in libheif/image/pixelimage.cc allocates the destination Alpha plane using the first plane's 8-bit depth, then iterates a later 10-bit or 12-bit Alpha component and writes uint16_t samples into the same 8-bit allocation. The output geometry controls the overflow extent and the encoded sample values control the data written, allowing a remote file processed by heif_decode_image() to cause a heap out-of-bounds write. This issue is fixed in version 1.23.2.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-787

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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