Out-of-bounds Read in Strukturag Libheif
CVE-2026-84449
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.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Strukturag Libheif — versions < 1.19.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-84449?
- CVE-2026-84449 is a low-severity vulnerability in Strukturag Libheif, classified under Out-of-bounds Read. CVSS score: 3.7/10. Published 2026-09-18.
- How severe is CVE-2026-84449?
- Low severity. CVSS v3 base score is 3.7 out of 10.