# CVE-2026-3950: libheif: A vulnerability was identified in strukturag libheif up to 1.21.2

CVE-2026-3950 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-3950, released March 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-3950
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2026

## Description

A vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not approved yet.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | heif-gdk-pixbuf Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [heif-gdk-pixbuf 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-heif-gdk-pixbuf-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | heif-gdk-pixbuf Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [heif-gdk-pixbuf 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-gdk-pixbuf-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | heif-thumbnailer Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [heif-thumbnailer 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-heif-thumbnailer-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | heif-thumbnailer Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [heif-thumbnailer 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-thumbnailer-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | heif-view Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [heif-view 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-heif-view-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | heif-view Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [heif-view 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-heif-view-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif Debian 14 | 1.23.1-1 | [DEBIAN-CVE-2026-3950](https://patchblox.com/security/data/fix/linux/debian-cve-2026-3950.md) | Mar 11, 2026 |
| Linux | libheif opensuse-leap 16.0 | 1.23.0-160000.1.1 | [OPENSUSE-SU-2026:20974-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20974-1.md) | Jun 17, 2026 |
| Linux | libheif sles 15.7 | 1.23.0-150700.3.15.1 | [SUSE-SU-2026:2622-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2622-1.md) | Jun 24, 2026 |
| Linux | libheif sles 16.0 | 1.23.0-160000.1.1 | [SUSE-SU-2026:22153-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22153-1.md) | Jun 17, 2026 |
| Linux | libheif-examples Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-examples 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-examples-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-examples Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-examples 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-examples-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-aomdec Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-aomdec 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-aomdec-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-aomdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-aomdec 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-aomdec-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-aomenc Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-aomenc 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-aomenc-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-aomenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-aomenc 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-aomenc-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-dav1d Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-dav1d 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-dav1d-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-dav1d Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-dav1d 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-dav1d-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-ffmpegdec Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-ffmpegdec 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-ffmpegdec-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-ffmpegdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-ffmpegdec 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-ffmpegdec-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-j2kdec Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-j2kdec 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-j2kdec-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-j2kdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-j2kdec 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-j2kdec-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-j2kenc Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-j2kenc 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-j2kenc-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-j2kenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-j2kenc 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-j2kenc-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-jpegdec Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-jpegdec 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-jpegdec-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-jpegdec Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-jpegdec 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-jpegdec-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-jpegenc Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-jpegenc 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-jpegenc-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-jpegenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-jpegenc 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-jpegenc-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-kvazaar Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-kvazaar 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-kvazaar-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-kvazaar Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-kvazaar 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-kvazaar-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-libde265 Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-libde265 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-libde265-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-libde265 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-libde265 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-libde265-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-rav1e Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-rav1e 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-rav1e-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-rav1e Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-rav1e 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-rav1e-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-svtenc Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-svtenc 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-svtenc-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-svtenc Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-svtenc 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-svtenc-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugin-x265 Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugin-x265 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugin-x265-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugin-x265 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugin-x265 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugin-x265-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif-plugins-all Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif-plugins-all 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif-plugins-all-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif-plugins-all Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif-plugins-all 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif-plugins-all-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |
| Linux | libheif1 Ubuntu 25.10 (questing) | 1.20.2-1ubuntu0.4 | [libheif1 1.20.2-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libheif1-1.20.2-1ubuntu0.4.md) | Jun 24, 2026 |
| Linux | libheif1 Ubuntu 26.04.1 LTS (resolute) | 1.21.2-3ubuntu0.1 | [libheif1 1.21.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libheif1-1.21.2-3ubuntu0.1.md) | Jul 21, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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