Incorrect calculation in libheif - #VU131964
Published: May 20, 2026
Vulnerability identifier: #VU131964
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-682
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: struktur AG
Affected software:
libheif
libheif
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass container-boundary checks.
The vulnerability exists due to incorrect calculation in BitstreamRange::BitstreamRange(istr, start, end) in libheif/bitstream.cc when parsing crafted HEIF or AVIF files with a non-zero container start offset. A remote attacker can supply a specially crafted file to bypass container-boundary checks.
The demonstrated impact is limited to incorrect parsing behavior, with no crash, memory corruption, data exfiltration, or availability impact shown on the standard in-memory parse path.
Remediation
Install security update from vendor's website.