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CVE-2026-84450— libheif: `clap` + oversized `ispe` aborts on an assert in `Fraction::Fraction` (incomplete fix for CVE-2026-62289)

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.

libheif 是一个 HEIF 和 AVIF 文件格式的解码器与编码器。从版本 1.19.0 到 1.23.3，一个精心构造的包含 clap 属性且 ispe 宽度或高度大于 INT32_MAX + 1 的图片项，可以通过 heif_image_handle_get_image_tiling() 触发裁剪计算。Box_clap::left_rounded() 或 Box_clap::top_rounded() 会将“图像尺寸减一”传入 Fraction::Fraction()，其 uint32_t 构造函数使用断

CVSS 4.3 · Medium EPSS 0.28% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif >= 1.19.0, < 1.23.3 affected
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I. Basic Information for CVE-2026-84450

Vulnerability Information
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Vulnerability Title
libheif: `clap` + oversized `ispe` aborts on an assert in `Fraction::Fraction` (incomplete fix for CVE-2026-62289)
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, a crafted image item containing a clap property and an ispe width or height greater than INT32_MAX + 1 can reach crop calculations through heif_image_handle_get_image_tiling(). Box_clap::left_rounded() or Box_clap::top_rounded() passes the image dimension minus one to Fraction::Fraction(), whose uint32_t constructor uses an assertion as input validation, causing assert-enabled builds to abort. Release builds can instead compute invalid crop geometry, and the tiling API returns dimensions that the normal decode security limits reject. This issue is fixed in version 1.23.3.
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
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif >= 1.19.0, < 1.23.3 -

II. Public POCs for CVE-2026-84450

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III. Intelligence Information for CVE-2026-84450

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Vendor Advisories for CVE-2026-84450 (1)

Other References for CVE-2026-84450 (1)

Same Patch Batch · strukturag · 2026-09-18 · 9 CVEs total

CVE-2026-84383 9.8 CRITICAL libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes fro
CVE-2026-84447 7.5 HIGH libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching a
CVE-2026-84446 7.5 HIGH libheif: Sequence decode timing-table initialization allows non-terminating loops and unbo
CVE-2026-84384 7.5 HIGH libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-b
CVE-2026-84444 7.4 HIGH libheif uncompressed tiled image encoding allows out-of-bounds write
CVE-2026-84451 6.5 MEDIUM libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds r
CVE-2026-84448 4.0 MEDIUM libheif: Heap out-of-bounds read in libheif inline-mask region API (heif_region_item_add_r
CVE-2026-84449 3.7 LOW libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-617