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CVE-2026-47247— libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation

Quick assessment

Affected
strukturag libheif
Exploitation
Public or AI PoC available; prioritize validation
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之前版本存在安全漏洞，该漏洞源于两个bug连用导致进程堆内存泄漏为解码网格图像中可见像素值，可能导致攻击者上传特制AVIF/HEIC文件恢复堆数据。

CVSS 7.5 · High EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
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I. Basic Information for CVE-2026-47247

Vulnerability Information
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Vulnerability Title
libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips, ImageMagick, etc.) can recover heap data - including library function pointers sufficient to defeat ASLR, or any other secret - from the publicly-downloadable transcoded JPEG/PNG/WebP output. Local attack vectors are also possible. Version 1.22.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
strukturag libheif 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
strukturag libheif是strukturag的图像编解码库。 strukturag libheif 1.22.0之前版本存在安全漏洞，该漏洞源于两个bug连用导致进程堆内存泄漏为解码网格图像中可见像素值，可能导致攻击者上传特制AVIF/HEIC文件恢复堆数据。
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-2026-47247

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 11784 chars
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III. Intelligence Information for CVE-2026-47247

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Vendor Advisories for CVE-2026-47247 (1)

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

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-2026-47714 6.1 MEDIUM libheif has integer overflow in inline mask size calculation that causes undersized buffer
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-200

V. Comments for CVE-2026-47247

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