SB20260819128 - Ubuntu update for libheif
Published: August 19, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Integer underflow (CVE-ID: CVE-2026-62289)
CWE-ID: CWE-191 - Integer underflow
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer underflow in the Fraction constructor when processing a crafted HEIF/AVIF file through the tiling API with process_image_transformations=1. A remote attacker can supply a specially crafted file to cause a denial of service.
User interaction is required to open the crafted file, or the issue can be triggered server-side when uploaded content is processed automatically.
2) Out-of-bounds read (CVE-ID: CVE-2026-62292)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds read in unc_decoder::get_compressed_image_data_uncompressed() when decoding an advertised image tile from a crafted HEIF uncompressed image through heif_image_handle_decode_image_tile(). A remote attacker can supply a specially crafted HEIF file and trigger tile decoding to cause a denial of service.
The issue is not triggered by merely opening the file; the vulnerable path is reached when an application enumerates tiling metadata and decodes an advertised tile.
Remediation
Install update from vendor's website.