# CVE-2026-42146: cimg: CImg Library is a C++ library for image processing

CVE-2026-42146 is fixed in 10 products on 1 platform, first by DEBIAN-CVE-2026-42146, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-42146
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 4, 2026

## Description

CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | CImg Fedora 43 | 1:3.7.6-2.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | CImg-devel Fedora 43 | 1:3.7.6-2.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | cimg Debian 13.5 (trixie) | 3.5.2+dfsg-1+deb13u1 | [DEBIAN-CVE-2026-42146](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42146.md) | May 15, 2026 |
| Linux | cimg Debian 14 | 3.5.2+dfsg-2 | [DEBIAN-CVE-2026-42146](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42146.md) | May 15, 2026 |
| Linux | gmic Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | gmic-debuginfo Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | gmic-debugsource Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | gmic-devel Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | gmic-gimp Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | gmic-libs Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |
| Linux | gmic-libs-debuginfo Fedora 43 | 3.7.6-3.fc43 | [FEDORA-2026-86596F9CBC](https://patchblox.com/security/data/fix/linux/fedora-2026-86596f9cbc.md) | May 20, 2026 |

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Data as of 2026-11-09T01:18:40Z 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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