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CVE-2026-47251— libheif has an incomplete fix for CVE-2026-3949: integer overflow bypass in vvdec_push_data2

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之前版本存在安全漏洞，该漏洞源于整数溢出，安全检查可被绕过，允许特制的HEIF文件触发越界堆读取。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.16% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
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I. Basic Information for CVE-2026-47251

Vulnerability Information
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Vulnerability Title
libheif has an incomplete fix for CVE-2026-3949: integer overflow bypass in vvdec_push_data2
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
strukturag libheif 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
strukturag libheif是strukturag的图像编解码库。 strukturag libheif 1.22.0之前版本存在安全漏洞，该漏洞源于整数溢出，安全检查可被绕过，允许特制的HEIF文件触发越界堆读取。
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-2026-47251

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III. Intelligence Information for CVE-2026-47251

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Vendor Advisories for CVE-2026-47251 (1)

Proof of Concept for CVE-2026-47251 (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-2026-47714 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

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-125

V. Comments for CVE-2026-47251

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