CVE-2026-47714: libheif has integer overflow in inline mask size calculation that causes undersized buffer allocation
Last updated 10 July 2026
Other sources
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, the inline mask parsing code in libheif/region.cc contains an integer overflow. Both width and height are unsigned int (32-bit) values parsed from the HEIF file. Their product can exceed UINT32MAX, wrapping to a small value before the division by 8. This causes an undersized buffer allocation, leading to out-of-bounds memory access when the mask data is later interpreted as a width x height bitmap. Version 1.22.0 patches the issue.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/libheifto a version that resolves this vulnerability.Fixed in 1.23.1-1 - Upgrade
Upgrade
libheifto a version that resolves this vulnerability.Fixed in 1.22.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-47714?
The severity of CVE-2026-47714 is medium, rated at 6.1.
What type of vulnerability is CVE-2026-47714?
CVE-2026-47714 is an integer overflow vulnerability.
How do I fix CVE-2026-47714?
To fix CVE-2026-47714, update libheif to version 1.21.3 or later.
What causes CVE-2026-47714?
CVE-2026-47714 is caused by an integer overflow in the inline mask size calculation leading to undersized buffer allocation.
Which software is affected by CVE-2026-47714?
CVE-2026-47714 affects versions of libheif prior to 1.21.3.