CVE-2026-50018

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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 v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 14, 2026

Last Modified

September 30, 2026

Advisory Details (3)

Auto-updated Sep 11, 2026
Patch available. Sources: github, github_pr, github_release.
GitHub release Patch Available

v1.12.8

Patch available: SpectoLabs/hoverfly v1.12.8

https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8
GitHub pull request

fix(action): timeout remote post-serve HTTP client (GHSA-42j2-w334-qxw7)

Fix merged in SpectoLabs/hoverfly PR #1228 on 2026-05-27 — awaiting tagged release

https://github.com/SpectoLabs/hoverfly/pull/1228
GitHub advisoryMentions a patch (unverified)

Denial of Service via Goroutine Leak in Remote Post-Serve Actions · Advisory · SpectoLabs/hoverfly · GitHub

https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7

Vendor Advisories for CVE-2026-50018(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/SpectoLabs/hoverfly—
  • every version up to 1.12.8: fixed in 1.12.8
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-12 15:59 UTCEG score recompute
  4. 2026-10-11 19:42 UTCEG score recompute
  5. 2026-10-11 16:57 UTCEG score recompute
  6. 2026-10-11 14:21 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-09-30 18:11 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-09-28 08:57 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-09-24 09:01 UTCEG score recompute
Show 17 more
  1. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-09-23 03:32 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  4. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  5. 2026-09-18 04:52 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  7. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  8. 2026-09-14 20:27 UTCEG score recompute
  9. 2026-09-14 19:35 UTCEG score recompute
  10. 2026-09-14 06:58 UTCEG score recompute
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  12. 2026-09-13 07:40 UTCEG score recompute
  13. 2026-09-11 23:11 UTCEG score recompute
  14. 2026-07-31 08:18 UTCEG score recompute
  15. 2026-07-26 11:43 UTCEG score recompute
  16. 2026-07-23 03:18 UTCEG score recompute
  17. 2026-07-14 18:10 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-50018?
CVE-2026-50018 is a medium-severity vulnerability; its CVE record was published on July 14, 2026. 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…
When was the CVE record for CVE-2026-50018 published?
The CVE record for CVE-2026-50018 was published on July 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 30, 2026; the record at its source may have been updated since.
Is CVE-2026-50018 actively exploited?
CVE-2026-50018 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50018?
CVE-2026-50018 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-50018?
A fix for CVE-2026-50018 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50018 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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