CVE-2026-84449
Published:September 18, 2026
Updated:September 22, 2026
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 Packages
libheif (CONAN):
Affected version(s) >=1.9.1 <1.20.1Fix Suggestion:
Update to version 1.20.1https://github.com/strukturag/libheif.git (GITHUB):
Affected version(s) >=v1.5.0 <v1.19.6Fix Suggestion:
Update to version v1.19.6libheif-js (NPM):
Affected version(s) >=1.6.0 <1.19.8Fix Suggestion:
Update to version 1.19.8Related Resources (3)
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Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
EPSS
Base Score:
0.34