What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-22
• Weakness: CWE-125

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.

Affected products

• strukturag libheif: before 1.19.6

References

• https://github.com/strukturag/libheif/commit/e29953da30eb11aa1762df0bff3b36be4b22fbe3
• https://github.com/strukturag/libheif/releases/tag/v1.19.6
• https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq
• https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq

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