Out-of-bounds read in libheif - #VU146738
Published: September 2, 2026
Vulnerability identifier: #VU146738
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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 Op_RGB24_32_to_YCbCr::convert_colorspace when encoding an image and converting RGB data to YCbCr. A remote attacker can supply a crafted image with extreme dimensions to trigger a crash and cause a denial of service.
The issue results in a read memory access error and segmentation fault during image encoding.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.19.6