CVE-2018-4438

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
8.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), public exploit)
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 8.8Exploit: Exploit-DB (verified) · public exploitExposed: 0

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

A logic issue existed resulting in memory corruption. This was addressed with improved state management. This issue affected versions prior to iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
70(Track)
EG Risk 70/100SSVC: 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
Severity88% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

April 3, 2019

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

About the security content of Safari 12.0.2 - Apple Support

https://support.apple.com/kb/HT209344
generic

About the security content of watchOS 5.1.2 - Apple Support

https://support.apple.com/kb/HT209343
generic

About the security content of tvOS 12.1.1 - Apple Support

https://support.apple.com/kb/HT209342
generic

About the security content of iOS 12.1.1 - Apple Support

https://support.apple.com/kb/HT209340
generic

About the security content of iCloud for Windows 7.9 - Apple Support

https://support.apple.com/kb/HT209346
generic

About the security content of iTunes 12.9.2 for Windows - Apple Support

https://support.apple.com/kb/HT209345

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.22.3-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.22.3-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.22.3-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.22.3-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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 116 total refreshes for this CVE.

  1. 2026-08-20 22:51 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-18 13:44 UTCEPSS rescore
  4. 2026-08-17 13:43 UTCEPSS rescore
  5. 2026-08-16 14:52 UTCEPSS rescore
  6. 2026-08-16 02:10 UTCEPSS rescore
  7. 2026-08-15 01:26 UTCEPSS rescore
  8. 2026-08-13 21:56 UTCEPSS rescore
  9. 2026-08-12 13:47 UTCEPSS rescore
  10. 2026-08-09 13:43 UTCEPSS rescore
  11. 2026-08-08 16:32 UTCEPSS rescore
  12. 2026-08-07 16:23 UTCEPSS rescore
  13. 2026-08-06 13:42 UTCEPSS rescore
  14. 2026-08-06 05:51 UTCOSV refresh
  15. 2026-08-04 15:05 UTCEPSS rescore
  16. 2026-08-04 10:33 UTCEPSS rescore
  17. 2026-08-03 10:31 UTCEPSS rescore
  18. 2026-08-02 02:23 UTCEPSS rescore
  19. 2026-08-01 04:12 UTCEPSS rescore
  20. 2026-07-30 16:24 UTCEPSS rescore
  21. 2026-07-30 01:27 UTCEPSS rescore
  22. 2026-07-28 15:32 UTCEPSS rescore
  23. 2026-07-26 14:51 UTCEPSS rescore
  24. 2026-07-25 14:14 UTCEPSS rescore
  25. 2026-07-25 14:14 UTCEPSS rescore
Show 75 more
  1. 2026-07-24 14:14 UTCEPSS rescore
  2. 2026-07-24 14:14 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 14:15 UTCEPSS rescore
  5. 2026-07-23 01:36 UTCEG score recompute
  6. 2026-07-22 22:16 UTCEG score recompute
  7. 2026-07-22 14:05 UTCEPSS rescore
  8. 2026-07-21 15:22 UTCEPSS rescore
  9. 2026-07-20 19:02 UTCOSV refresh
  10. 2026-07-20 17:04 UTCEPSS rescore
  11. 2026-07-20 17:04 UTCEPSS rescore
  12. 2026-07-19 14:28 UTCEPSS rescore
  13. 2026-07-19 14:28 UTCEPSS rescore
  14. 2026-07-19 02:26 UTCEPSS rescore
  15. 2026-07-19 02:26 UTCEPSS rescore
  16. 2026-07-16 16:59 UTCEPSS rescore
  17. 2026-07-16 16:59 UTCEPSS rescore
  18. 2026-07-15 16:55 UTCEPSS rescore
  19. 2026-07-15 01:56 UTCEPSS rescore
  20. 2026-07-13 22:27 UTCEPSS rescore
  21. 2026-07-13 06:10 UTCEPSS rescore
  22. 2026-07-12 05:43 UTCEPSS rescore
  23. 2026-07-09 19:06 UTCEPSS rescore
  24. 2026-07-08 15:11 UTCEPSS rescore
  25. 2026-07-08 15:11 UTCEPSS rescore
  26. 2026-07-07 13:42 UTCEPSS rescore
  27. 2026-07-07 13:42 UTCEPSS rescore
  28. 2026-07-06 16:25 UTCEPSS rescore
  29. 2026-07-06 16:24 UTCEPSS rescore
  30. 2026-07-06 02:20 UTCEPSS rescore
  31. 2026-07-05 02:27 UTCEPSS rescore
  32. 2026-07-04 06:28 UTCEPSS rescore
  33. 2026-07-04 06:28 UTCEPSS rescore
  34. 2026-07-03 14:26 UTCOSV refresh
  35. 2026-07-01 15:03 UTCEPSS rescore
  36. 2026-07-01 15:03 UTCEPSS rescore
  37. 2026-06-30 23:20 UTCEPSS rescore
  38. 2026-06-30 23:20 UTCEPSS rescore
  39. 2026-06-28 14:04 UTCEPSS rescore
  40. 2026-06-28 04:53 UTCEPSS rescore
  41. 2026-06-28 04:53 UTCEPSS rescore
  42. 2026-06-27 03:06 UTCEPSS rescore
  43. 2026-06-27 03:06 UTCEPSS rescore
  44. 2026-06-25 13:47 UTCEPSS rescore
  45. 2026-06-25 13:47 UTCEPSS rescore
  46. 2026-06-24 14:02 UTCEPSS rescore
  47. 2026-06-24 14:02 UTCEPSS rescore
  48. 2026-06-23 21:30 UTCEPSS rescore
  49. 2026-06-23 21:30 UTCEPSS rescore
  50. 2026-06-22 14:23 UTCEPSS rescore
  51. 2026-06-22 14:23 UTCEPSS rescore
  52. 2026-06-21 14:54 UTCEPSS rescore
  53. 2026-06-21 14:54 UTCEPSS rescore
  54. 2026-06-21 01:57 UTCEPSS rescore
  55. 2026-06-21 01:57 UTCEPSS rescore
  56. 2026-06-18 17:50 UTCEPSS rescore
  57. 2026-06-18 17:50 UTCEPSS rescore
  58. 2026-06-17 17:50 UTCEPSS rescore
  59. 2026-06-16 17:50 UTCEPSS rescore
  60. 2026-06-16 17:50 UTCEPSS rescore
  61. 2026-06-15 17:45 UTCEPSS rescore
  62. 2026-06-15 04:13 UTCOSV refresh
  63. 2026-06-14 23:15 UTCEPSS rescore
  64. 2026-06-14 23:15 UTCEPSS rescore
  65. 2026-06-13 22:58 UTCEPSS rescore
  66. 2026-06-12 23:09 UTCEPSS rescore
  67. 2026-06-12 23:09 UTCEPSS rescore
  68. 2026-06-11 13:57 UTCEPSS rescore
  69. 2026-06-10 22:16 UTCEPSS rescore
  70. 2026-06-10 13:19 UTCEPSS rescore
  71. 2026-06-06 13:45 UTCEPSS rescore
  72. 2026-06-06 13:45 UTCEPSS rescore
  73. 2026-06-05 22:45 UTCEPSS rescore
  74. 2026-06-05 22:45 UTCEPSS rescore
  75. 2026-06-05 06:08 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-45984✓ verified
    First seen Dec 13, 2018

    WebKit JIT - Int32/Double Arrays can have Proxy Objects in the Prototype Chains

    Open source ↗

Frequently asked(5)

What is CVE-2018-4438?
CVE-2018-4438 is a high vulnerability published on April 3, 2019. A logic issue existed resulting in memory corruption. This was addressed with improved state management. This issue affected versions prior to iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.
When was CVE-2018-4438 disclosed?
CVE-2018-4438 was first published in the National Vulnerability Database on April 3, 2019, 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-2018-4438 actively exploited?
CVE-2018-4438 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.4% of all scored CVEs.
What is the CVSS score of CVE-2018-4438?
CVE-2018-4438 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-4438?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-4438, 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.

Dependency Blast Radius

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