CVE-2026-27887CWE-770CWE-774CWE-789

Spin has memory leaks in various WIT interfaces

Medium · published February 26, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
13.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
EPSS
0.00226 · 13.2th percentile
Weaknesses
CWE-770 · Allocation of Resources Without Limits or Throttling; CWE-774 · Allocation of File Descriptors or Handles Without Limits or Throttling; CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-02-26T00:55Z
EPSS history
Timeline
  • 26 FEB 00:55Z
    Spin has memory leaks in various WIT interfaces
    cvelistv5