CVE-2026-27887 Spin has memory leaks in various WIT interfaces
Attackers can cause Spin host crashes via memory exhaustion by triggering unbounded database or web server responses.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27887?
CVE-2026-27887 is a medium-severity denial of service vulnerability in spinframework SpinKube, published on 26 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Spin is an open source developer tool for building and running serverless applications powered by WebAssembly. When Spin is configured to allow connections to a database or web server which could return responses of unbounded size (e.g. tables with many rows or large content bodies), Spin may in some cases attempt to buffer the entire response before delivering it to the guest, which can lead to the host process running out of memory, panicking, and crashing. In addition, a malicious guest application could incrementally insert a large number of rows or values into a database and then retrieve them all in a single query, leading to large host allocations. Spin 3.6.1, SpinKube 0.6.2, and `containerd-shim-spin` 0.22.1 have been patched to address the issue. As a workaround, configure Spin to only allow access to trusted databases and HTTP servers which limit response sizes.
Which versions are affected by CVE-2026-27887?
How do I fix CVE-2026-27887?
No fix has been published for CVE-2026-27887 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-27887 being exploited?
There is no known exploitation of CVE-2026-27887 in the wild and no public exploit code.
Sources
Also known as GHSA-mv4f-6ffm-32wx.