SixLabors ImageSharp Has Infinite Loop in GIF Decoder When Skipping Malformed Comment Extension Blocks
Impact
A specially crafted GIF file containing a malformed comment extension block (with a missing block terminator) can cause the ImageSharp GIF decoder to enter an infinite loop while attempting to skip the block. This leads to a denial of service. Applications processing untrusted GIF input should upgrade to a patched version.
Patches
The problem has been patched. All users are advised to upgrade to v3.1.11 or v2.1.11.
Workarounds
None.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | SixLabors.ImageSharp | < 2.1.11, >= 3.0.0, < 3.1.11 | 2.1.11, 3.1.11 |
References
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-rxmq-m78w-7wmc
- https://nvd.nist.gov/vuln/detail/CVE-2025-54575
- https://github.com/SixLabors/ImageSharp/issues/2953
- https://github.com/SixLabors/ImageSharp/commit/55e49262df9a057dff9b7807ed1b7bdb49187c3f
- https://github.com/SixLabors/ImageSharp/commit/833f3ceec35af6b775950e06f03b934546cefbf6
- https://github.com/SixLabors/ImageSharp
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness (CWE)
CWE-400, CWE-770- Platform
- .NET (NuGet)
- Package
SixLabors.ImageSharp- Disclosed
- 30.07.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-rxmq-m78w-7wmc - CC BY 4.0
Vulnerability history: SixLabors.ImageSharp
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 03.2024 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 7
- Medium 7
Disclosures per year
- 2024: 5
- 2025: 2
- 2026: 7
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SixLabors ImageSharp Has Infinite Loop in GIF Decoder When Skipping Malformed Comment Extension Blocks this entry
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