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CVE-2026-84449— libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV

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 HEIF 和 AVIF 文件格式的解码器和编码器。在 1.19.6 版本之前， 函数将图像平面的步幅（stride）存储在一个整数宽度的变量中，当通过 和 创建极其大的 RGB 图像时，该整数值可能会发生溢出。由此产生的“回绕”（wrapped）步幅会导致 中的颜色转换循环计算出无效输入指针，并在 执行 RGB 到 YCbCr 转换时，从已分配的交错平面之外读取数据。这可能会导致编码过程崩溃。该问题已在 1.19.6 版本中修复。

CVSS 3.7 · Low EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.19.6 affected
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I. Basic Information for CVE-2026-84449

Vulnerability Information
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Vulnerability Title
libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif < 1.19.6 -

II. Public POCs for CVE-2026-84449

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III. Intelligence Information for CVE-2026-84449

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Vendor Advisories for CVE-2026-84449 (1)

Other References for CVE-2026-84449 (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-2026-84450 4.3 MEDIUM libheif: `clap` + oversized `ispe` aborts on an assert in `Fraction::Fraction` (incomplete
CVE-2026-84448 4.0 MEDIUM libheif: Heap out-of-bounds read in libheif inline-mask region API (heif_region_item_add_r

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-190