CVE-2026-120208

High

Description

libheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attackers can craft a HEIF file declaring, for example, 16-bit Cb and 8-bit Cr to trigger file-controlled heap writes past the Cr plane, potentially achieving code execution in image-processing pipelines.

SeverityHigh

CVSS7.5

Exploit probability—

ProductStrukturag Libheif

PublishedOct 31, 2026

First seenNov 4, 2026

Weakness typeCWE-122CWE-122

How to fix

Update

strukturag libheif1.23.3 or later

Patches

github.com/strukturag/libheif/commit/9d3cd91d7b1c8c68deef6d06057ab956bcb0dfb9

Vendor advisories

Affected products

Product	Affected versions	Fixed in
strukturag libheif	1.18.0 ≤ v < 1.23.3	1.23.3

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