# CVE-2026-62377: libheif: libheif is a HEIF and AVIF file format decoder and encoder CVE-2026-62377 is fixed in 20 products on 1 platform, first by SUSE-SU-2026:3597-1, released August 12, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-62377 - Priority: Routine - CVSS: 4.3 (medium) - EPSS: 0.0041 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 12, 2026 ## Description libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF sequence accepted by heif_context_read_from_memory() can leave the context with no registered sequence tracks and crash when heif_context_get_track(ctx, 0) is called. HeifContext::get_track() in libheif/context.cc executes assert(has_sequence()) before its normal error handling, so assert-enabled builds abort instead of allowing the public wrapper in libheif/api/libheif/heif_sequences.cc to return null. In release builds, removing the assertion lets the track_id zero path dereference m_tracks.begin()->second on an empty map, which is undefined behavior and typically crashes. The issue is reachable through documented public APIs after parsing attacker-controlled bytes. This issue is fixed in version 1.23.1. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | heif-gdk-pixbuf Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [heif-gdk-pixbuf 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-gdk-pixbuf-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | heif-thumbnailer Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [heif-thumbnailer 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-thumbnailer-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | heif-view Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [heif-view 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-view-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif Debian 14 | 1.23.1-1 | [DEBIAN-CVE-2026-62377](https://patchblox.com/security/data/fix/linux/debian-cve-2026-62377.md) | Aug 20, 2026 | | Linux | libheif opensuse-leap 16.0 | 1.23.1-160000.1.1 | [OPENSUSE-SU-2026:21644-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21644-1.md) | Aug 25, 2026 | | Linux | libheif sles 15.7 | 1.23.1-150700.3.18.1 | [SUSE-SU-2026:3597-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3597-1.md) | Aug 12, 2026 | | Linux | libheif sles 16.0 | 1.23.1-160000.1.1 | [SUSE-SU-2026:23320-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23320-1.md) | Aug 25, 2026 | | Linux | libheif-examples Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-examples 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-examples-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-aomdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-aomdec 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-aomdec-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-aomenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-aomenc 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-aomenc-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-dav1d Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-dav1d 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-dav1d-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-ffmpegdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-ffmpegdec 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-ffmpegdec-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-j2kdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-j2kdec 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-j2kdec-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-j2kenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-j2kenc 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-j2kenc-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-jpegdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-jpegdec 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-jpegdec-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-jpegenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-jpegenc 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-jpegenc-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-kvazaar Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-kvazaar 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-kvazaar-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-libde265 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-libde265 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-libde265-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-rav1e Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-rav1e 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-rav1e-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-svtenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-svtenc 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-svtenc-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugin-x265 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugin-x265 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-x265-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif-plugins-all Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif-plugins-all 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugins-all-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | | Linux | libheif1 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.5 | [libheif1 1.21.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif1-1.21.2-3ubuntu0.5.md) | Aug 19, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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