CVE-2026-18482

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-20. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100CISA SSVC

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%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
1.7%
EPSS %ILE
75th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 3, 2026

Advisory Details (3)

Auto-updated Oct 1, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

CVE-2026-18482 : neo.mjs · novice-22

https://novice-22.com/posts/neo-mjs/
github_commit

commit 88c77fc4 (neomjs/neo)

Fix landed in neomjs/neo commit 88c77fc4 — awaiting tagged release

https://github.com/neomjs/neo/commit/88c77fc4
github_commit

commit 5acc564ea1b2 (neomjs/neo)

Fix landed in neomjs/neo commit 5acc564ea1b2 — awaiting tagged release

https://github.com/neomjs/neo/commit/5acc564ea1b278bca5fab1f8f397a6ba9b849d75

Vendor Advisories for CVE-2026-18482(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 40× in last 7d / 194× 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 276 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18482?
CVE-2026-18482 is a critical vulnerability published on August 20, 2026. Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS…
When was CVE-2026-18482 disclosed?
CVE-2026-18482 was first published on August 20, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18482 actively exploited?
CVE-2026-18482 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (75th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18482?
CVE-2026-18482 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18482?
An upstream fix for CVE-2026-18482 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-18482 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18482

Explore →

Is Your Infrastructure Affected by CVE-2026-18482?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs