GHSA-63p8-c4ww-9cg7 is a high-severity (CVSS 7.5) Out-of-bounds Write vulnerability in SixLabors.ImageSharp. A fix is available for SixLabors.ImageSharp — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-63p8-c4ww-9cg7.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
SixLabors.ImageSharp.NETSixLabors.ImageSharpReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
Impact
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.
Patches
The problem has been patched. All users are advised to upgrade to v3.1.5 or v2.1.9.
Workarounds
None.
References
https://github.com/SixLabors/ImageSharp/pull/2754 https://github.com/SixLabors/ImageSharp/pull/2756
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | SixLabors.ImageSharp | all versions | 2.1.9dotnet add package SixLabors.ImageSharp --version 2.1.9 |
| .NETNuGet | SixLabors.ImageSharp | ≥ 3.0.0&&< 3.1.5 | 3.1.5dotnet add package SixLabors.ImageSharp --version 3.1.5 |
Affected Products
imagesharpsixlaborsDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for SixLabors.ImageSharp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update SixLabors.ImageSharp to 2.1.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-63p8-c4ww-9cg7 is resolved across your whole dependency graph.
Workarounds
Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.
Frequently Asked Questions
Is GHSA-63p8-c4ww-9cg7 in your dependencies?
Find it across NuGet, including transitive dependencies.