# CVE-2026-56378: ImageMagick - Heap Out-of-Bounds Read in PCD Decoder > A crafted PCD file triggers a heap out-of-bounds read in ImageMagick, causing denial of service and potential information disclosure. - **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 21 Jun 2026 - **Updated:** 29 Oct 2026 - **Also known as:** CLSA-2026-1790065439, DEBIAN-CVE-2026-56378, ECHO-e8f8-bb4b-0500, GHSA-jmqv-2mx7-544h, GHSA-wgxp-q8xq-wpp9, JLSEC-2026-1059, UBUNTU-CVE-2026-56378 ## What is CVE-2026-56378? CVE-2026-56378 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 21 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description ImageMagick before 7.1.2-15 (and 6.x before 6.9.13-40) contains a heap out-of-bounds read in the PCD coder's DecodeImage loop. A crafted PCD file can trigger a one-byte heap out-of-bounds read during image decoding, resulting in denial of service and potential disclosure of an adjacent heap byte. Weakness: CWE-125 (Out-of-bounds Read) ## Which versions are affected by CVE-2026-56378? 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-2026-56378? Upgrade Magick.NET-Q16-AnyCPU to 14.10.3 or later. ## Is CVE-2026-56378 being exploited? There is no known exploitation of CVE-2026-56378 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-2026-56378 and fix it if it is affected. What it is: CVE-2026-56378 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 21 Jun 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-2026-56378 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-2026-56378/ (Markdown: https://insights.sbomify.com/CVE-2026-56378/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56378 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56378 - OSV: https://osv.dev/vulnerability/CVE-2026-56378 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-56378/ Summaries are generated and may contain mistakes; the official description above is the record.