Out-of-bounds write in libheif - CVE-2026-47178
Published: May 20, 2026
Vulnerability identifier: #VU131961
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-47178
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to out-of-bounds write in unc_decoder_component_interleave::decode_tile() when parsing a crafted HEIF file using the uncompressed unci codec with tiled, component-interleaved 4:2:0 content. A remote attacker can supply a specially crafted HEIF file to execute arbitrary code.
Only instances built with WITH_UNCOMPRESSED_CODEC=ON are vulnerable.
Affected software
libheif
Debian Linux
Ubuntu
libheif (Debian package)
libheif (Ubuntu package)
Debian Linux
Ubuntu
libheif (Debian package)
libheif (Ubuntu package)
How to mitigate CVE-2026-47178
Install security update from vendor's website.
libheif - update to 1.22.0
libheif (Debian package) - update to 1.19.8-1+deb13u1
libheif (Ubuntu package) - addressed in versions 1.20.2-1ubuntu0.5, 1.21.2-3ubuntu0.2
libheif (Debian package) - update to 1.19.8-1+deb13u1
libheif (Ubuntu package) - addressed in versions 1.20.2-1ubuntu0.5, 1.21.2-3ubuntu0.2