CVE-2026-12199

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 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(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
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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https://huntr.com/bounties/cee4ca6a-d17f-4746-abad-c68119633d37

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nltk3.10.0-1 ... 3.9.3-1 (12 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nltk3.10.0-1 ... 3.9.3-1 (9 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nltk3.10.0-1 ... 3.9.3-1 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nltk3.10.0-1 ... 3.9.3-1 (6 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 41× 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 237 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 0% probability of exploitation in the next 30 days, which ranks it in the top 74.5% of all scored CVEs.
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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