Out-of-bounds read in libheif - CVE-2026-49271
Published: June 26, 2026
Vulnerability identifier: #VU135510
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-49271
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 unc_decoder::get_compressed_image_data_uncompressed when parsing a crafted HEIF file with wrapped icef compressed-unit offsets and sizes. A remote attacker can supply a specially crafted HEIF file to cause a denial of service.
The issue is reached when the cmpC compressed unit type is not image_tile, and user interaction is required to decode the crafted media.
Affected software
libheif
Ubuntu
libheif (Ubuntu package)
Ubuntu
libheif (Ubuntu package)
How to mitigate CVE-2026-49271
Install security update from vendor's website.
libheif - update to 1.22.1
libheif (Ubuntu package) - addressed in versions 1.20.2-1ubuntu0.5, 1.21.2-3ubuntu0.2
libheif (Ubuntu package) - addressed in versions 1.20.2-1ubuntu0.5, 1.21.2-3ubuntu0.2