CVE-2025-27598 Out-of-bounds Write in SixLabors ImageSharp
Attackers can cause a denial of service via a crafted GIF file exploiting an out-of-bounds write in the ImageSharp library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-27598?
CVE-2025-27598 is a high-severity memory corruption vulnerability in SixLabors ImageSharp, published on 6 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ImageSharp is a 2D graphics API. An Out-of-bounds Write vulnerability has been found in the ImageSharp gif decoder, allowing attackers to cause a crash using a specially crafted gif. This can potentially lead to denial of service. The problem has been patched. All users are advised to upgrade to v3.1.7 or v2.1.10.
Weakness: CWE-787
Which versions are affected by CVE-2025-27598?
4 open source packages ship an affected version, including SixLabors.ImageSharp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
SixLabors.ImageSharp NuGet | All versions | 2.1.10 |
SixLabors.ImageSharp NuGet | All versions | 2.1.10 |
SixLabors.ImageSharp NuGet | From 3.0.0 | 3.1.7 |
SixLabors.ImageSharp NuGet | From 3.0.0 | 3.1.7 |
Products include Sixlabors Imagesharp.
How do I fix CVE-2025-27598?
Upgrade SixLabors.ImageSharp to a fixed version for your release line: 2.1.10 or 3.1.7.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-27598 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-27598 exists.
Other vulnerabilities in SixLabors ImageSharp
- CVE-2026-106110 ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer
- CVE-2026-106112 ImageSharp: ICC LUT16 output channel count can write beyond Vector4
- CVE-2026-106113 ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram index
- CVE-2026-106115 ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer
- CVE-2026-106117 ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp
Sources
Also known as ECHO-05f5-dd06-9cbd, GHSA-2cmq-823j-5qj8.