CVE-2026-12252

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-04. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

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

In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulnerable to untrusted JAR code execution. These classes accept user-controllable JAR paths and execute them via the java() function, which invokes subprocess.Popen() without integrity verification. This vulnerability is identical to CVE-2026-0848, which was fixed for StanfordSegmenter by adding SHA256 verification. However, the fix was not applied to these additional classes, leaving them susceptible to arbitrary code execution when loading untrusted JAR files.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: 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
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

July 4, 2026

Last Modified

July 8, 2026

Advisory Details (1)

Auto-updated Jul 4, 2026
No patch confirmed yet.
generic

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Vendor Advisories for CVE-2026-12252(1)

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

Affected Packages

(5 across 5 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, 3.10.1-1, 3.9.1-2, 3.9.2-1, 3.9.3-13.10.3-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
nltk0.8 ... 3.9b1 (64 versions)3.9.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 55× 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 206 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12252?
CVE-2026-12252 is a high vulnerability published on July 4, 2026. In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulnerable to untrusted JAR code execution. These classes accept user-controllable JAR paths and execute…
When was CVE-2026-12252 disclosed?
CVE-2026-12252 was first published in the National Vulnerability Database on July 4, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12252 actively exploited?
CVE-2026-12252 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 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-12252?
CVE-2026-12252 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-12252?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12252, 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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