CVE-2026-126296 json
NLTK before 3.10.4 Path Traversal via save_maxent_params and load_maxent_params
published 20d ago modified yesterday also EUVD-2026-125225 , GHSA-59f9-gqg8-mqpj
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository nltk/nltk. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 4.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
Summary
NLTK before 3.10.4 contains a path traversal vulnerability in save_maxent_params() and load_maxent_params() that bypasses the pathsec filesystem restriction mechanism. Attackers who control the tab_dir argument can read or overwrite model parameter files outside permitted data roots, because the functions call Python's built-in open() directly.
Patch / fix
- pypi nltk 3.10.4
- nltk nltk 3.10.4
Is CVE-2026-126296 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-14).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
| CNA | 4.0 | 6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | nltk | <=3.10.3 |
3.10.4 |
Affected products
- nltk nltk
Classification
- Weakness
-
- CWE-73 External Control of File Name or Path
References
-
github.com
/nltk/nltk/security/advisories/GHSA-59f9-gqg8-mqpj
vendor-advisory, advisory
-
vulncheck.com
/advisories/nltk-before-3.10.4-path-traversal-via-save-maxent-params-and-load-maxent-params
third-party-advisory
Sources
- CVE List CVE-2026-126296
- NVD CVE-2026-126296
- Maintainer advisory GHSA-59f9-gqg8-mqpj
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of nltk/nltk published their own advisory on GitHub. Reviewed sources take precedence over it.