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CVE-2026-120208— libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder

Quick assessment

Affected
strukturag libheif
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 1.23.3 之前的 libheif 1.18.0 版本中， 函数存在一个基于堆的缓冲区溢出漏洞。攻击者可通过提供位深不一致的色度分量（chroma components），触发越界写入。例如，攻击者可构造一个 HEIF 文件，声明 Cb 分量为 16 位、Cr 分量为 8 位，从而在 Cr 平面之后执行由文件内容控制的堆写入操作，进而在图像处理流程中实现代码执行。

CVSS 7.5 · High EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif 1.18.0< 1.23.3 affected
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I. Basic Information for CVE-2026-120208

Vulnerability Information
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Vulnerability Title
libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif 1.18.0 ~ 1.23.3 -

II. Public POCs for CVE-2026-120208

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-120208

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Other References for CVE-2026-120208 (1)

Other References for CVE-2026-120208 (4)

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-122