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CVE-2026-62289— libheif: Integer underflow in Fraction constructor via double clap transform application

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.

struktur AG libheif是struktur AG组织的一款图像编解码库。 struktur AG libheif 1.23.0及之前版本存在安全漏洞，该漏洞源于处理clean aperture box时存在整数下溢问题，导致图像尺寸变为零，可能造成崩溃或平铺结果损坏。

CVSS 4.3 · Medium EPSS 0.39% · P33

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.23.1 affected
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I. Basic Information for CVE-2026-62289

Vulnerability Information
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Vulnerability Title
libheif: Integer underflow in Fraction constructor via double clap transform application
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF or AVIF file containing a clean aperture box can reduce an image dimension to zero and crash or corrupt tiling results when heif_image_handle_get_image_tiling(handle, 1, &tiling) is called. ImageItem::get_heif_image_tiling() returns already transformed dimensions, and process_image_transformations_on_tiling() applies the clean aperture transformation again. The second application passes zero to Box_clap::left_rounded(0), where image_width minus one underflows and constructs Fraction(0xFFFFFFFF, 2). Debug builds reach an assertion and abort, while release builds can return a corrupt crop and zero-width tiling result. The affected implementation spans libheif/image-items/image_item.cc, libheif/context.cc, and libheif/box.cc. This issue is fixed in version 1.23.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
struktur AG libheif 数字错误漏洞
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 1.23.0及之前版本存在安全漏洞，该漏洞源于处理clean aperture box时存在整数下溢问题，导致图像尺寸变为零，可能造成崩溃或平铺结果损坏。
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 < 1.23.1 -

II. Public POCs for CVE-2026-62289

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III. Intelligence Information for CVE-2026-62289

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Patches & Fixes for CVE-2026-62289 (1)

Vendor Advisories for CVE-2026-62289 (1)

Other References for CVE-2026-62289 (1)

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

CVE-2026-62292 8.7 HIGH libheif: Out-of-bounds read in uncompressed unci tile range slicing
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-2026-62377 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-191

V. Comments for CVE-2026-62289

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