Low severity · published Sep 18, 2026
CVE-2026-84449
libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV
3.7
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libheif · strukturag
< 1.19.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84449
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84449
github.com
https://github.com/strukturag/libheif/commit/e29953da30eb11aa1762df0bff3b36be4b22fbe3
github.com
https://github.com/strukturag/libheif/releases/tag/v1.19.6
github.com
https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq
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