Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M
CVE-2026-84449libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV
Low 3.7
In plain English
A low-severity integer overflow in libheif from strukturag. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libheif | no fix listed | DEBIAN-CVE-2026-84449 |
| Debian:13 | libheif | 1.19.7-1 | DEBIAN-CVE-2026-84449 |
| Debian:14 | libheif | 1.19.7-1 | DEBIAN-CVE-2026-84449 |
| Ubuntu:24.04:LTS | libheif | 1.17.6-1ubuntu4.9 | UBUNTU-CVE-2026-84449 |
| Ubuntu:24.04:LTS | libheif | 1.17.6-1ubuntu4.9 | USN-8846-1 |
| Ubuntu:26.04:LTS | libheif | 1.21.2-3ubuntu0.6 | USN-8846-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| strukturag | libheif | < 1.19.6 |
Weakness: CWE-190, CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L