# CVE-2026-84446: libheif: libheif is a HEIF and AVIF file format decoder and encoder CVE-2026-84446 is fixed in 20 products on 1 platform, first by heif-gdk-pixbuf 1.21.2-3ubuntu0.6, released September 18, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-84446 - Priority: High - CVSS: 7.5 (high) - EPSS: 0.0046 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 18, 2026 ## Description libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | heif-gdk-pixbuf Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [heif-gdk-pixbuf 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-gdk-pixbuf-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | heif-thumbnailer Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [heif-thumbnailer 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-thumbnailer-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | heif-view Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [heif-view 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-view-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif Debian 13.5 (trixie) | 1.23.4-1~deb13u1 | [DEBIAN-CVE-2026-84446](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84446.md) | Sep 19, 2026 | | Linux | libheif Debian 14 | 1.23.2-1 | [DEBIAN-CVE-2026-84446](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84446.md) | Sep 19, 2026 | | Linux | libheif opensuse-leap 16.0 | 1.23.4-160000.1.1 | [OPENSUSE-SU-2026:21889-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21889-1.md) | Sep 20, 2026 | | Linux | libheif sles 15.7 | 1.23.4-150700.3.21.1 | [SUSE-SU-2026:4276-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4276-1.md) | Sep 21, 2026 | | Linux | libheif-examples Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-examples 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-examples-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-aomdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-aomdec 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-aomdec-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-aomenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-aomenc 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-aomenc-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-dav1d Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-dav1d 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-dav1d-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-ffmpegdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-ffmpegdec 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-ffmpegdec-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-j2kdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-j2kdec 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-j2kdec-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-j2kenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-j2kenc 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-j2kenc-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-jpegdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-jpegdec 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-jpegdec-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-jpegenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-jpegenc 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-jpegenc-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-kvazaar Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-kvazaar 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-kvazaar-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-libde265 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-libde265 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-libde265-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-rav1e Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-rav1e 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-rav1e-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-svtenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-svtenc 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-svtenc-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugin-x265 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugin-x265 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-x265-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif-plugins-all Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif-plugins-all 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugins-all-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | | Linux | libheif1 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.6 | [libheif1 1.21.2-3ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif1-1.21.2-3ubuntu0.6.md) | Sep 18, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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