Multiple Vulnerabilities Found in libheif Library
Several high-risk flaws in libheif could allow attackers to trigger denial of service or access sensitive data. These issues affect image parsing and memory handling in Ubuntu 26.04 LTS.
TL;DR
- Six vulnerabilities discovered in libheif, including out-of-bounds reads and integer overflows.
- Issues impact Ubuntu 26.04 LTS systems using HEIF image processing features.
- Attackers may exploit these flaws to cause crashes or extract sensitive information.
- Vulnerabilities stem from improper input validation in image parsing components.
- Immediate patching recommended for systems relying on libheif functionality.
Security researchers have uncovered multiple vulnerabilities within the libheif library, which is used for handling HEIF (High Efficiency Image Format) files. These flaws range from out-of-bounds reads to integer overflows, all of which could be exploited by attackers to compromise system stability or access sensitive information.
The affected systems primarily include Ubuntu 26.04 LTS deployments where libheif is utilized for image processing tasks. Given the nature of the vulnerabilities, organizations using this library should prioritize applying available patches to mitigate potential exploitation risks.
Technical Breakdown of Flaws
- An out-of-bounds read exists in the HEIF sequence track parser (CVE-2026-47254), potentially leaking process memory.
- Null pointer dereference found in the image tiling interface (CVE-2026-47709) can lead to application crashes.
- Integer overflow during inline mask size calculation (CVE-2026-47714) allows resource exhaustion or buffer over-reads.
- Grid image tile coordinate transform suffers from integer underflow (CVE-2026-48029), enabling malformed image attacks.
- Missing bounds checks in the HEIF sequence parser result in unbounded heap allocations (CVE-2026-50142).
Impact and Mitigation Steps
- Exploitation may lead to denial of service through crafted HEIF images or abnormal termination of dependent applications.
- Sensitive data leakage is possible via controlled reads into adjacent memory segments.
- Only Ubuntu 26.04 LTS systems are confirmed vulnerable at this time.
- Users should update their libheif packages immediately using standard package managers.
- Developers integrating HEIF support should audit third-party libraries regularly for upstream fixes.
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