# CVE-2026-25794: ImageMagick has heap-buffer-overflow via signed integer overflow in WriteUHDRImage when writing UHDR images with large dimensions > Attacker can cause heap overflow and potential code execution by providing large image dimensions to ImageMagick's UHDR writer. - **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 24 Feb 2026 - **Updated:** 15 Jul 2026 - **Also known as:** DEBIAN-CVE-2026-25794, ECHO-d0bc-1155-4868, GHSA-vhqj-f5cj-9x8h, JLSEC-2026-944, MINI-63f4-2r55-cgc4, UBUNTU-CVE-2026-25794 ## What is CVE-2026-25794? CVE-2026-25794 is a high-severity vulnerability in Imagemagick Imagemagick, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description ImageMagick is free and open-source software used for editing and manipulating digital images. `WriteUHDRImage` in `coders/uhdr.c` uses `int` arithmetic to compute the pixel buffer size. Prior to version 7.1.2-15, when image dimensions are large, the multiplication overflows 32-bit `int`, causing an undersized heap allocation followed by an out-of-bounds write. This can crash the process or potentially lead to an out of bounds heap write. Version 7.1.2-15 contains a patch. Weakness: CWE-190 (Integer Overflow or Wraparound), CWE-122 (Heap-based Buffer Overflow) ## Which versions are affected by CVE-2026-25794? 38 open source packages ship an affected version, including Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU and Magick.NET-Q16-HDRI-OpenMP-arm64. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `Magick.NET-Q16-AnyCPU` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-AnyCPU` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-AnyCPU` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-AnyCPU` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-OpenMP-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-OpenMP-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-OpenMP-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-OpenMP-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-HDRI-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-OpenMP-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-OpenMP-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-OpenMP-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-OpenMP-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-OpenMP-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-OpenMP-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q16-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-AnyCPU` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-AnyCPU` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-OpenMP-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-OpenMP-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-OpenMP-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-OpenMP-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-arm64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-x64` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-x86` | NuGet | All versions | 14.10.3 | | `Magick.NET-Q8-x86` | NuGet | All versions | 14.10.3 | Products: Imagemagick Imagemagick. ## How do I fix CVE-2026-25794? Upgrade Magick.NET-Q16-AnyCPU to 14.10.3 or later. ## Is CVE-2026-25794 being exploited? There is no known exploitation of CVE-2026-25794 in the wild and no public exploit code. ## Other vulnerabilities in Imagemagick Imagemagick - [CVE-2019-19952](https://insights.sbomify.com/CVE-2019-19952/): Use after free in n/a (critical 9.8) - [CVE-2018-16328](https://insights.sbomify.com/CVE-2018-16328/): Null dereference in n/a (critical 9.8) - [CVE-2018-16329](https://insights.sbomify.com/CVE-2018-16329/): Null dereference in n/a (critical 9.8) - [CVE-2017-18210](https://insights.sbomify.com/CVE-2017-18210/): Null dereference in n/a (critical 9.8) - [CVE-2017-14138](https://insights.sbomify.com/CVE-2017-14138/): Denial of service in n/a (critical 9.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-25794 and fix it if it is affected. What it is: CVE-2026-25794 is a high-severity vulnerability in Imagemagick Imagemagick, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-25794 in the wild and no public exploit code. Affected packages and fixed versions: - Magick.NET-Q16-AnyCPU (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-AnyCPU (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-AnyCPU (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-AnyCPU (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-arm64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-arm64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-x64 (NuGet): affected all versions; fixed in 14.10.3 - Magick.NET-Q16-HDRI-x64 (NuGet): affected all versions; fixed in 14.10.3 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-25794/ (Markdown: https://insights.sbomify.com/CVE-2026-25794/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25794 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25794 - OSV: https://osv.dev/vulnerability/CVE-2026-25794 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-25794/ Summaries are generated and may contain mistakes; the official description above is the record.