SB2026070131 - Ubuntu update for libheif
Published: July 1, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2026-47178)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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/E:U/U:Amber
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.
2) Out-of-bounds read (CVE-ID: CVE-2026-49271)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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/E:U/U:Green
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.
Remediation
Install update from vendor's website.