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CVE-2026-62292— libheif: Out-of-bounds read in uncompressed unci tile range slicing

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.

struktur AG libheif是struktur AG组织的一款图像编解码库。 struktur AG libheif 1.19.0版本至1.23.1之前版本存在缓冲区错误漏洞，该漏洞源于处理特制未压缩HEIF图像时tile偏移计算存在整数回绕，绕过边界检查，可能导致越界读取和进程崩溃。

CVSS 8.7 · High EPSS 0.54% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif >= 1.19.0, < 1.23.1 affected
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I. Basic Information for CVE-2026-62292

Vulnerability Information
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Vulnerability Title
libheif: Out-of-bounds read in uncompressed unci tile range slicing
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.1, a crafted uncompressed HEIF image using generic zlib unci full-item compression can crash an application that decodes an advertised tile with heif_image_handle_decode_image_tile(). In libheif/codecs/uncompressed/unc_decoder.cc, unc_decoder::fetch_tile_data() computes a large tile offset and unc_decoder::get_compressed_image_data_uncompressed() validates it with range_start_offset plus range_size. For the last advertised tile (4095, 4095), the addition can wrap to zero, bypass the bounds check, and pass an invalid source pointer and a one-terabyte length to memcpy. The observed result is an out-of-bounds read and process crash; opening the file alone does not trigger the issue because tile decoding is required. This issue is fixed in version 1.23.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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
struktur AG libheif 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
struktur AG libheif是struktur AG组织的一款图像编解码库。 struktur AG libheif 1.19.0版本至1.23.1之前版本存在缓冲区错误漏洞，该漏洞源于处理特制未压缩HEIF图像时tile偏移计算存在整数回绕，绕过边界检查，可能导致越界读取和进程崩溃。
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 >= 1.19.0, < 1.23.1 -

II. Public POCs for CVE-2026-62292

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 14416 chars
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III. Intelligence Information for CVE-2026-62292

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Patches & Fixes for CVE-2026-62292 (1)

Vendor Advisories for CVE-2026-62292 (1)

Other References for CVE-2026-62292 (1)

Same Patch Batch · strukturag · 2026-08-18 · 5 CVEs total

CVE-2026-50142 7.5 HIGH libheif: unbounded heap allocation in HEIF sequence parser (stsz fixed-size mode missing b
CVE-2026-62291 5.3 MEDIUM libheif: Heap out of bounds write in libheif uncompressed encoder when writing images with
CVE-2026-62289 4.3 MEDIUM libheif: Integer underflow in Fraction constructor via double clap transform application
CVE-2026-62377 4.3 MEDIUM libheif: Reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-62292

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