Out-of-bounds read in libheif - #VU146739
Published: September 2, 2026
Vulnerability identifier: #VU146739
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in unc_decoder::get_compressed_image_data_uncompressed() when decoding an advertised uncompressed image tile from a crafted HEIF file through the public tile API. A remote attacker can provide a crafted HEIF file to cause a denial of service.
User interaction is required to open or process a crafted HEIF file, and the demonstrated trigger requires decoding a high-index advertised tile through heif_image_handle_decode_image_tile().
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.3