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CVE-2026-50018

Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions

Published: Sep 11, 2026Updated: Sep 14, 2026 Sources: CVE List NVDCWE-400
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 77.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400CWE-770

Affected Products

SpectoLabs
commercial
hoverflyMixed
DevTools & CI / build-test-tools

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/SpectoLabs/hoverfly/pull/1228
github.com
https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8
github.com
https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7
github.com

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