CVE-2018-10199

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In versions of mruby up to and including 1.4.0, a use-after-free vulnerability exists in src/io.c::File#initilialize_copy(). An attacker that can cause Ruby code to be run can possibly use this to execute arbitrary code.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
82%
KEV
Not listed

Published

April 18, 2018

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Aug 21, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Use after free in File#initilialize_copy · Issue #4001 · mruby/mruby · GitHub

https://github.com/mruby/mruby/issues/4001
github_commit

commit b51b21fc63c9 (mruby/mruby)

Fix landed in mruby/mruby commit b51b21fc63c9 — awaiting tagged release

https://github.com/mruby/mruby/commit/b51b21fc63c9805862322551387d9036f2b63433

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
mruby—1.4.0+20180418+git54905e98-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
mruby—1.4.0+20180418+git54905e98-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
mruby—1.4.0+20180418+git54905e98-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
mruby—1.4.0+20180418+git54905e98-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-08-26 14:41 UTCEPSS rescore
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  1. 2026-07-23 14:15 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-10199?
CVE-2018-10199 is a critical vulnerability published on April 18, 2018. In versions of mruby up to and including 1.4.0, a use-after-free vulnerability exists in src/io.c::File#initilialize_copy(). An attacker that can cause Ruby code to be run can possibly use this to execute arbitrary code.
When was CVE-2018-10199 disclosed?
CVE-2018-10199 was first published in the National Vulnerability Database on April 18, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-10199 actively exploited?
CVE-2018-10199 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 17.9% of all scored CVEs.
What is the CVSS score of CVE-2018-10199?
CVE-2018-10199 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-10199?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-10199, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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