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CVE-2026-47714— libheif has integer overflow in inline mask size calculation that causes undersized buffer allocation

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.

strukturag libheif是strukturag的图像编解码库。 strukturag libheif 1.22.0之前版本存在数字错误漏洞，该漏洞源于libheif/region.cc中内联遮罩解析代码存在整数溢出，导致缓冲区分配不足，造成越界内存访问。

CVSS 6.1 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
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I. Basic Information for CVE-2026-47714

Vulnerability Information
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Vulnerability Title
libheif has integer overflow in inline mask size calculation that causes undersized buffer allocation
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, the inline mask parsing code in `libheif/region.cc` contains an integer overflow. Both `width` and `height` are `unsigned int` (32-bit) values parsed from the HEIF file. Their product can exceed `UINT32_MAX`, wrapping to a small value before the division by 8. This causes an undersized buffer allocation, leading to out-of-bounds memory access when the mask data is later interpreted as a `width x height` bitmap. Version 1.22.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
strukturag libheif 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
strukturag libheif是strukturag的图像编解码库。 strukturag libheif 1.22.0之前版本存在数字错误漏洞，该漏洞源于libheif/region.cc中内联遮罩解析代码存在整数溢出，导致缓冲区分配不足，造成越界内存访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif < 1.22.0 -

II. Public POCs for CVE-2026-47714

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III. Intelligence Information for CVE-2026-47714

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Vendor Advisories for CVE-2026-47714 (1)

Same Patch Batch · strukturag · 2026-07-21 · 8 CVEs total

CVE-2026-47247 7.5 HIGH libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel
CVE-2026-45382 6.9 MEDIUM libde265 has a heap-buffer-overflow READ in decode_slice_unit_tiles via unvalidated PPS ti
CVE-2026-47178 6.1 MEDIUM libheif has Heap Out Of Bounds Write in unci subsystem
CVE-2026-47254 6.1 MEDIUM libheif Has Heap Buffer Overflow in `Track::get_next_sample_raw_data()` -- OOB Chunk Vecto
CVE-2026-45383 libde265 has a heap buffer overflow (OOB read) in decode_slice_unit_WPP() via out-of-bound
CVE-2026-47709 libheif has a NULL pointer dereference in heif_image_handle_get_image_tiling for malformed
CVE-2026-47251 libheif has an incomplete fix for CVE-2026-3949: integer overflow bypass in vvdec_push_dat

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-190

V. Comments for CVE-2026-47714

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