CVE-2018-12026

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.9%, top 22% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

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

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
78.1%
KEV
Not listed

Published

June 17, 2018

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated May 28, 2026
No patch confirmed yet.
generic

Passenger: Multiple Vulnerabilities (GLSA 201807-02) — Gentoo security

https://security.gentoo.org/glsa/201807-02

Affected Packages

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
passenger5.3.0, 5.3.15.3.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 42× 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.

  1. 2026-07-22 22:12 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-21 15:21 UTCEPSS rescore
  4. 2026-07-21 10:48 UTCOSV refresh
  5. 2026-07-20 17:04 UTCEPSS rescore
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  1. 2026-07-04 06:28 UTCEPSS rescore
  2. 2026-07-04 06:26 UTCOSV refresh
  3. 2026-07-02 16:54 UTCEPSS rescore
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  30. 2026-06-15 18:09 UTCOSV refresh
  31. 2026-06-15 17:45 UTCEPSS rescore
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  40. 2026-06-08 14:14 UTCEPSS rescore
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  42. 2026-06-07 15:22 UTCEPSS rescore
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  44. 2026-06-06 13:45 UTCEPSS rescore
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  59. 2026-05-29 13:41 UTCEPSS rescore
  60. 2026-05-28 13:42 UTCEPSS rescore
  61. 2026-05-28 13:42 UTCEPSS rescore
  62. 2026-05-28 06:33 UTCEG score recompute
  63. 2026-05-27 13:38 UTCEPSS rescore
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  67. 2026-05-26 07:17 UTCEPSS rescore
  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-26 04:46 UTCOSV refresh

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-12026?
CVE-2018-12026 is a critical vulnerability published on June 17, 2018. During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in…
When was CVE-2018-12026 disclosed?
CVE-2018-12026 was first published in the National Vulnerability Database on June 17, 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-2018-12026 actively exploited?
CVE-2018-12026 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-12026?
CVE-2018-12026 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-12026?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12026, 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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