CVE-2026-50018Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions
Updated under an hour ago ()
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It affects SpectoLabs hoverfly. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
SpectoLabs hoverfly spectolabs:hoverfly (from the name) | before 1.12.8 | CNA record |
References
- https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7x-refsource-confirm
- https://github.com/SpectoLabs/hoverfly/pull/1228x-refsource-misc
- https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.