CVE-2026-126302 json
NLTK 3.9.4 before 3.10.4 Symlink Sandbox Escape via chat80.sql_query
published 19d ago modified yesterday also EUVD-2026-125219 , GHSA-xmfg-f9cm-w86q
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
- 3.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
NLTK from 3.9.4 before 3.10.4 contains a symlink following vulnerability in nltk.sem.chat80.sql_query() that bypasses the pathsec data-root sandbox containment check. Attackers who can write into a trusted NLTK data root can plant a symbolic link to read SQLite databases outside the sandbox.
Patch / fix
- pypi nltk 3.10.4
- nltk nltk 3.10.4
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- yesterday
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-14).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 3.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | nltk | >=3.9.4, <=3.10.3 |
3.10.4 |
Affected products
- nltk nltk
Classification
- Weakness
-
- CWE-59 Improper Link Resolution Before File Access
References
-
github.com
/nltk/nltk/security/advisories/GHSA-xmfg-f9cm-w86q
vendor-advisory, advisory
-
vulncheck.com
/advisories/nltk-3.9.4-before-3.10.4-symlink-sandbox-escape-via-chat80-sql-query
third-party-advisory
Sources
- CVE List CVE-2026-126302
- NVD CVE-2026-126302
- Maintainer advisory GHSA-xmfg-f9cm-w86q
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.