# CVE-2026-3949: libheif: A vulnerability was determined in strukturag libheif up to 1.21.2

CVE-2026-3949 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-3949, released March 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-3949
- Priority: Routine
- CVSS: n/a (low)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2026

## Description

A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdec_push_data2 of the file libheif/plugins/decoder_vvdec.cc of the component HEIF File Parser. Executing a manipulation of the argument size can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called b97c8b5f198b27f375127cd597a35f2113544d03. It is advisable to implement a patch to correct this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | heif-pixbuf-loader amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 2026 |
| Linux | heif-pixbuf-loader-debuginfo amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 2026 |
| Linux | libheif Debian 13.5 (trixie) | 1.23.1-1 | [DEBIAN-CVE-2026-3949](https://patchblox.com/security/data/fix/linux/debian-cve-2026-3949.md) | Mar 11, 2026 |
| Linux | libheif Debian 14 | 1.23.1-1 | [DEBIAN-CVE-2026-3949](https://patchblox.com/security/data/fix/linux/debian-cve-2026-3949.md) | Mar 11, 2026 |
| Linux | libheif amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 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-debuginfo amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 2026 |
| Linux | libheif-debugsource amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 2026 |
| Linux | libheif-devel amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 2026 |
| Linux | libheif-tools amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 2026 |
| Linux | libheif-tools-debuginfo amzn 2023 | 1.19.8-1.amzn2023.0.4 | [ALAS2023-2026-1509](https://patchblox.com/security/data/fix/linux/alas2023-2026-1509.md) | Mar 30, 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.