CVE-2026-62292 libheif: Out-of-bounds read in uncompressed unci tile range slicing
An integer overflow in libheif allows attackers to cause a denial of service via a crafted HEIF image requiring tile decoding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-62292?
CVE-2026-62292 is a high-severity vulnerability in strukturag libheif, published on 18 Aug 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. From 1.19.0 until 1.23.1, a crafted uncompressed HEIF image using generic zlib unci full-item compression can crash an application that decodes an advertised tile with heif_image_handle_decode_image_tile(). In libheif/codecs/uncompressed/unc_decoder.cc, unc_decoder::fetch_tile_data() computes a large tile offset and unc_decoder::get_compressed_image_data_uncompressed() validates it with range_start_offset plus range_size. For the last advertised tile (4095, 4095), the addition can wrap to zero, bypass the bounds check, and pass an invalid source pointer and a one-terabyte length to memcpy. The observed result is an out-of-bounds read and process crash; opening the file alone does not trigger the issue because tile decoding is required. This issue is fixed in version 1.23.1.
Weakness: CWE-125
Which versions are affected by CVE-2026-62292?
How do I fix CVE-2026-62292?
Upgrade to a fixed version.
Is CVE-2026-62292 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62292 exists.
Sources
Also known as BELL-CVE-2026-62292, DEBIAN-CVE-2026-62292, ECHO-8e41-0efd-8249, GHSA-73p7-m7gg-w2jv, MINI-fmc3-5ghj-rw37, ROOT-OS-DEBIAN-11-CVE-2026-62292 and 3 more.