# CVE-2026-84450: libheif: libheif is a HEIF and AVIF file format decoder and encoder

CVE-2026-84450 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-84450, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-84450
- Priority: Routine
- CVSS: 4.3 (medium)
- EPSS: 0.0028
- 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. From 1.19.0 until 1.23.3, a crafted image item containing a clap property and an ispe width or height greater than INT32_MAX + 1 can reach crop calculations through heif_image_handle_get_image_tiling(). Box_clap::left_rounded() or Box_clap::top_rounded() passes the image dimension minus one to Fraction::Fraction(), whose uint32_t constructor uses an assertion as input validation, causing assert-enabled builds to abort. Release builds can instead compute invalid crop geometry, and the tiling API returns dimensions that the normal decode security limits reject. This issue is fixed in version 1.23.3.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | heif-pixbuf-loader amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |
| Linux | heif-pixbuf-loader-debuginfo amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |
| Linux | libheif Debian 13.5 (trixie) | 1.23.4-1~deb13u1 | [DEBIAN-CVE-2026-84450](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84450.md) | Sep 10, 2026 |
| Linux | libheif Debian 14 | 1.23.3-1 | [DEBIAN-CVE-2026-84450](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84450.md) | Sep 10, 2026 |
| Linux | libheif amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 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-debuginfo amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |
| Linux | libheif-debugsource amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |
| Linux | libheif-devel amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |
| Linux | libheif-tools amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |
| Linux | libheif-tools-debuginfo amzn 2023 | 1.23.4-1.amzn2023 | [ALAS2023-2026-3124](https://patchblox.com/security/data/fix/linux/alas2023-2026-3124.md) | Sep 28, 2026 |

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Data as of 2026-11-09T13:31:49Z 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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