Out-of-bounds read in libheif - #VU147375
Published: September 8, 2026
Vulnerability identifier: #VU147375
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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 disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the AOM and x265 encoder plugins when encoding a crafted YCbCr image with differing luma and chroma bit depths. A remote attacker can submit a crafted HEIF file for encoding to disclose sensitive information.
Only builds with a source codec that produces unequal per-channel bit depths and the AOM or x265 encoder plugin are affected.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.4