8.8

CVE-2026-79674: nltk External Control of File Name or Path

CVSS: 8.8v4.0HighAnalyzed
AliasesGHSA-3gq4-3j92-5w49PYSEC-2026-3736UBUNTU-CVE-2026-79674
Published 25-08-2026Last modified 25-08-2026
Open JSON

Vulnerability summary

CVE-2026-79674 is a high (CVSS 8.8) External Control of File Name or Path vulnerability in nltk. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.3% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
45/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v4.0 (CVE.org)
EPSS score
0.39%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2026-0340

Timeline

  1. 25-08-2026
    PublishedVulnerability first disclosed.
  2. 25-08-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

8 scores · 5 sources · 2 versions

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

+0.16 pp

From 0.23% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Nltk

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • nltkAll versions (No fix recorded) | < 3.10.3-1
Nltk1 product
PyPI1 product
  • nltk< 3.10.3
Ubuntu1 product
  • nltkAll versions (No fix recorded)

4 vendors · 4 products

References

10 links