CVE-2026-84449 libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV
An integer overflow in libheif allows attackers to cause a denial of service via crafted large RGB images during encoding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84449?
CVE-2026-84449 is a low-severity vulnerability in strukturag libheif, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-84449?
Linux distribution packages (1)
libheif openSUSE:Tumbleweed | All versions | 1.23.5-2.1 |
How do I fix CVE-2026-84449?
Upgrade to a fixed version.
Is CVE-2026-84449 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84449 exists.
Sources
Also known as DEBIAN-CVE-2026-84449, GHSA-2c3g-p585-8rpq, UBUNTU-CVE-2026-84449, openSUSE-SU-2026:11921-1.