CVE-2026-79674

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: Elevated riskExposed: 0

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

NLTK versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors that allows attackers to read files outside the intended data root. Attackers can supply arbitrary corpus root paths to LinThesaurusCorpusReader and PanLexLiteCorpusReader constructors to access filesystem content and SQLite databases outside the pathsec sandbox boundary.

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
68(Attend)
EG Risk 68/100SSVC: Attend

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
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 31, 2026

Advisory Details (1)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Corpus Reader Sandbox Bypass · Advisory · nltk/nltk · GitHub

https://github.com/nltk/nltk/security/advisories/GHSA-3gq4-3j92-5w49

Vendor Advisories for CVE-2026-79674(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: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 (68 versions)3.10.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 63× 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. 2026-09-19 07:13 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 05:12 UTCEG score recompute
  4. 2026-09-16 14:30 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 12:42 UTCEG score recompute
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-13 21:54 UTCEG score recompute
  11. 2026-09-12 20:06 UTCEG score recompute
  12. 2026-09-11 18:18 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-10 16:29 UTCEG score recompute
  16. 2026-09-09 01:14 UTCEG score recompute
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-07 19:19 UTCEG score recompute
  19. 2026-09-06 17:27 UTCEG score recompute
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-05 15:39 UTCEG score recompute
  22. 2026-09-05 02:44 UTCEG score recompute
  23. 2026-09-04 13:49 UTCEG score recompute
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-02 23:00 UTCEG score recompute
Show 38 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-02 10:06 UTCGHSA enrichment
  3. 2026-09-01 21:11 UTCEG score recompute
  4. 2026-09-01 21:11 UTCGHSA enrichment
  5. 2026-09-01 13:54 UTCEPSS rescore
  6. 2026-09-01 08:14 UTCEG score recompute
  7. 2026-09-01 08:14 UTCGHSA enrichment
  8. 2026-09-01 04:40 UTCEPSS rescore
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-08-31 19:14 UTCGHSA enrichment
  11. 2026-08-31 11:41 UTCGHSA enrichment
  12. 2026-08-30 22:47 UTCEG score recompute
  13. 2026-08-30 22:47 UTCGHSA enrichment
  14. 2026-08-30 19:18 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 09:54 UTCEG score recompute
  17. 2026-08-30 09:54 UTCGHSA enrichment
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-29 21:00 UTCGHSA enrichment
  20. 2026-08-29 08:06 UTCEG score recompute
  21. 2026-08-29 08:05 UTCGHSA enrichment
  22. 2026-08-28 21:42 UTCEPSS rescore
  23. 2026-08-28 19:07 UTCGHSA enrichment
  24. 2026-08-28 11:02 UTCGHSA enrichment
  25. 2026-08-27 22:06 UTCEG score recompute
  26. 2026-08-27 22:06 UTCGHSA enrichment
  27. 2026-08-27 14:25 UTCEPSS rescore
  28. 2026-08-27 09:12 UTCGHSA enrichment
  29. 2026-08-26 20:16 UTCEG score recompute
  30. 2026-08-26 20:16 UTCGHSA enrichment
  31. 2026-08-26 14:47 UTCEPSS rescore
  32. 2026-08-26 07:22 UTCEG score recompute
  33. 2026-08-26 07:22 UTCGHSA enrichment
  34. 2026-08-25 18:28 UTCEG score recompute
  35. 2026-08-25 17:55 UTCEG score recompute
  36. 2026-08-25 16:24 UTCEG score recompute
  37. 2026-08-25 15:30 UTCEG score recompute
  38. 2026-08-25 15:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-79674?
CVE-2026-79674 is a high vulnerability published on August 25, 2026. NLTK versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors that allows attackers to read files outside the intended data root. Attackers can supply arbitrary corpus root paths to LinThesaurusCorpusReader and PanLexLiteCorpusReader constructors to access…
When was CVE-2026-79674 disclosed?
CVE-2026-79674 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79674 actively exploited?
CVE-2026-79674 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 86.4% of all scored CVEs.
What is the CVSS score of CVE-2026-79674?
CVE-2026-79674 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-79674?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79674, 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-2026-79674

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