CVE-2026-27887Network attack vector

Host process crash via unbounded response buffering

Published Feb 26, 2026 · Updated Feb 26, 2026

Unbounded resource allocation in spinframework Spin, SpinKube, and Containerd Shim Spin allows remote authenticated users to crash hosts. The runtime buffers entire database or HTTP responses through multiple WIT interfaces without limiting host-side allocations. Reachability requires untrusted guest content or access to a server that returns unbounded responses; exhaustion panics and crashes the host process.

CVSS severity6.9
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unbounded resource allocation in spinframework Spin, SpinKube, and Containerd Shim Spin allows remote authenticated users to crash hosts. The runtime buffers entire database or HTTP responses through multiple WIT interfaces without limiting host-side allocations. Reachability requires untrusted guest content or access to a server that returns unbounded responses; exhaustion panics and crashes the host process.

The record

CVE
CVE-2026-27887
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
spinframework
Product
Spin
Classifications
CWE-789, CWE-774, CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

spinframework · Spinversion=< 3.6.1
spinframework · SpinKubeversion=< 0.6.2
spinframework · Containerd Shim Spinversion=< 0.22.1

Published CVSS scores

6.9GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
CWE-774Allocation of File Descriptors or Handles Without Limits or Throttling
CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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