CVE-2026-27798 ImageMagick: Heap Buffer Over-read in WaveletDenoise when processing small images
Attackers can cause a heap buffer over-read and potential crash or data leak by processing small images with the wavelet-denoise operator in ImageMagick.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27798?
CVE-2026-27798 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 25 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, a heap buffer over-read vulnerability occurs when processing an image with small dimension using the `-wavelet-denoise` operator. Versions 7.1.2-15 and 6.9.13-40 contain a patch.
Which versions are affected by CVE-2026-27798?
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 2 products.
| Package | 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 |
32 more packages
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 include Dlemstra Magick.net, Imagemagick Imagemagick.
How do I fix CVE-2026-27798?
Upgrade Magick.NET-Q16-AnyCPU to 14.10.3 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-27798 being exploited?
There is no known exploitation of CVE-2026-27798 in the wild and no public exploit code.
Other vulnerabilities in Imagemagick Imagemagick
- CVE-2026-24485 ImageMagick: Infinite loop vulnerability when parsing a PCD file
- CVE-2026-23952 ImageMagick has a NULL pointer dereference in MSL parser via <comment> tag before image load
- CVE-2026-24484 ImageMagick: Converting multi-layer nested MVG to SVG can cause DoS
- CVE-2026-25637 ImageMagick: Possible memory leak in ASHLAR encoder
- CVE-2026-25576 ImageMagick: Out of bounds read in multiple coders read raw pixel data
Sources
Also known as CLSA-2026-1774007111, CLSA-2026-1774027236, DEBIAN-CVE-2026-27798, ECHO-7a2a-53c3-6476, GHSA-qpgx-jfcq-r59f, JLSEC-2026-970 and 2 more.