CVE-2026-84383

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 v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/strukturag/libheif/commit/f4fb8bde4704ebb46e46ff9fb94407c9774153b2
https://github.com/strukturag/libheif/releases/tag/v1.23.2
https://github.com/strukturag/libheif/security/advisories/GHSA-g89c-p67h-r497
https://github.com/strukturag/libheif/security/advisories/GHSA-g89c-p67h-r497

Configurations

No configuration.

History

18 Sep 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-18 16:17

Updated : 2026-09-18 16:17

NVD link : CVE-2026-84383

Mitre link : CVE-2026-84383

CVE.ORG link : CVE-2026-84383

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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