CVE-2026-47714 libheif has integer overflow in inline mask size calculation that causes undersized buffer allocation
An integer overflow in libheif's inline mask parsing leads to undersized buffer allocation and out-of-bounds memory access, potentially allowing code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-47714?
CVE-2026-47714 is a medium-severity vulnerability in strukturag libheif, published on 21 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, the inline mask parsing code in `libheif/region.cc` contains an integer overflow. Both `width` and `height` are `unsigned int` (32-bit) values parsed from the HEIF file. Their product can exceed `UINT32_MAX`, wrapping to a small value before the division by 8. This causes an undersized buffer allocation, leading to out-of-bounds memory access when the mask data is later interpreted as a `width x height` bitmap. Version 1.22.0 patches the issue.
Weakness: CWE-190
Which versions are affected by CVE-2026-47714?
It affects 1 product.
Products include Struktur Libheif.
How do I fix CVE-2026-47714?
Upgrade to a fixed version.
Is CVE-2026-47714 being exploited?
There is no known exploitation of CVE-2026-47714 in the wild and no public exploit code.
Other vulnerabilities in strukturag libheif
Sources
Also known as BELL-CVE-2026-47714, DEBIAN-CVE-2026-47714, ECHO-1a7d-6048-6715, GHSA-h4wm-6wwf-qvhx, JLSEC-2026-1100, UBUNTU-CVE-2026-47714.