CVE-2026-12199

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-17. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

A vulnerability in nltk.app.wordnet_app up to version 3.9.3 allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when started in its default mode. The server listens on all interfaces and processes a specific unauthenticated GET request (/SHUTDOWN%20THE%20SERVER) to terminate the process immediately via os._exit(0). This results in a denial of service, impacting service availability. The issue arises due to insufficient authentication and protection mechanisms for critical server functions.

CVSS v3
7.5
EG Score
7.5(high)
EPSS
24.4%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Jun 18, 2026
No patch confirmed yet.
generic

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Vendor Advisories for CVE-2026-12199(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 36× in last 7d / 109× 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 109 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12199?
CVE-2026-12199 is a high vulnerability published on June 17, 2026. A vulnerability in nltk.app.wordnetapp up to version 3.9.3 allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when started in its default mode. The server listens on all interfaces and processes a specific unauthenticated GET request (/SHUTDOWN%20THE%20SERVER) to…
When was CVE-2026-12199 disclosed?
CVE-2026-12199 was first published in the National Vulnerability Database on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12199 actively exploited?
CVE-2026-12199 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12199?
CVE-2026-12199 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-12199?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12199, 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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