CVE-2026-12252

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH 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(high)
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
9%
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

(1 across 1 ecosystem)
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 15× in last 7d / 60× 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.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-27 12:46 UTCGHSA enrichment
  3. 2026-07-27 00:52 UTCEG score recompute
  4. 2026-07-27 00:52 UTCGHSA enrichment
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 12:54 UTCEG score recompute
  8. 2026-07-26 12:54 UTCGHSA enrichment
  9. 2026-07-25 14:17 UTCEPSS rescore
  10. 2026-07-24 14:17 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 03:05 UTCEG score recompute
  13. 2026-07-22 14:08 UTCEPSS rescore
  14. 2026-07-21 15:24 UTCEPSS rescore
  15. 2026-07-20 17:08 UTCEPSS rescore
  16. 2026-07-19 14:30 UTCEPSS rescore
  17. 2026-07-19 02:28 UTCEPSS rescore
  18. 2026-07-16 21:46 UTCGHSA enrichment
  19. 2026-07-16 17:02 UTCEPSS rescore
  20. 2026-07-16 09:56 UTCGHSA enrichment
  21. 2026-07-15 22:05 UTCGHSA enrichment
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 10:13 UTCGHSA enrichment
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-14 22:19 UTCGHSA enrichment
Show 35 more
  1. 2026-07-14 10:29 UTCGHSA enrichment
  2. 2026-07-13 22:38 UTCGHSA enrichment
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 10:48 UTCGHSA enrichment
  5. 2026-07-13 06:12 UTCEPSS rescore
  6. 2026-07-12 22:58 UTCGHSA enrichment
  7. 2026-07-12 11:07 UTCGHSA enrichment
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 23:17 UTCGHSA enrichment
  10. 2026-07-11 11:27 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-10 23:37 UTCGHSA enrichment
  13. 2026-07-10 11:46 UTCGHSA enrichment
  14. 2026-07-09 23:53 UTCGHSA enrichment
  15. 2026-07-09 19:10 UTCEPSS rescore
  16. 2026-07-09 12:03 UTCGHSA enrichment
  17. 2026-07-09 00:13 UTCGHSA enrichment
  18. 2026-07-08 15:15 UTCEPSS rescore
  19. 2026-07-08 15:15 UTCEPSS rescore
  20. 2026-07-08 12:22 UTCGHSA enrichment
  21. 2026-07-08 00:28 UTCGHSA enrichment
  22. 2026-07-07 13:46 UTCEPSS rescore
  23. 2026-07-07 12:39 UTCGHSA enrichment
  24. 2026-07-07 00:47 UTCGHSA enrichment
  25. 2026-07-06 16:27 UTCEPSS rescore
  26. 2026-07-06 12:57 UTCGHSA enrichment
  27. 2026-07-06 02:23 UTCEPSS rescore
  28. 2026-07-06 01:04 UTCGHSA enrichment
  29. 2026-07-05 13:14 UTCGHSA enrichment
  30. 2026-07-05 02:30 UTCEPSS rescore
  31. 2026-07-05 02:30 UTCEPSS rescore
  32. 2026-07-05 01:22 UTCGHSA enrichment
  33. 2026-07-04 13:32 UTCGHSA enrichment
  34. 2026-07-04 01:42 UTCEG score recompute
  35. 2026-07-04 01:41 UTCMITRE cvelistV5first tracked

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 90.6% 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-12252

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