SpectoLabs Hoverfly up to 1.12.7 Remote Post-Serve Actions http.DefaultClient.Do memory allocation

Summaryinfo

A vulnerability labeled as problematic has been found in SpectoLabs Hoverfly up to 1.12.7. Affected is the function http.DefaultClient.Do of the component Remote Post-Serve Actions. The manipulation results in memory allocation. This vulnerability is known as CVE-2026-50018. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in SpectoLabs Hoverfly up to 1.12.7. It has been classified as problematic. Affected is the function http.DefaultClient.Do of the component Remote Post-Serve Actions. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. CVE summarizes:

Hoverfly is an open source API simulation tool. Prior to version 1.12.8, remote post-serve actions use `http.DefaultClient` without any timeout configuration. When the remote endpoint is unreachable or intentionally slow (accepts TCP connection but never responds), each triggered proxy request spawns a goroutine that blocks indefinitely on `http.DefaultClient.Do()`. An attacker can cause unbounded goroutine accumulation leading to memory exhaustion and process crash (OOM kill). Unlike local post-serve action execution, this requires no binary execution, only a URL pointing to a non-responsive endpoint. Version 1.12.8 patches the issue.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-50018 since 06/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 1.12.8 eliminates this vulnerability.

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Productinfo

Vendor

• SpectoLabs

Name

• Hoverfly

Version

• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4
• 1.12.5
• 1.12.6
• 1.12.7

Website

• Product: https://github.com/SpectoLabs/hoverfly/

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