Advisory details:
pypa / nltk/PYSEC-2026-2237
| Advisory ID | pypa/nltk/PYSEC-2026-2237 |
| Aliases |
CVE-2026-33236
GHSA-469j-vmhf-r6v7 PYSEC-2026-2237 |
| Summary | NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.3 |
| Risk | 3.6 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 8.1 | https://github.com/pypa/advisory-database/blob/main/vulns/nltk/PYSEC-2026-2237.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:37275 | ||
| https://bugzilla.redhat.com/show_bug.cgi?id=2449824 | ||
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33236.json | ||
| 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a | Other | https://github.com/nltk/nltk/commit/89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a |
| CVE-2026-33236 | https://access.redhat.com/security/cve/CVE-2026-33236 | |
| GHSA-469j-vmhf-r6v7 | Other | https://github.com/nltk/nltk/security/advisories/GHSA-469j-vmhf-r6v7 |
| RHSA-2026:10184 | Advisory | https://access.redhat.com/errata/RHSA-2026:10184 |
| RHSA-2026:19712 | https://access.redhat.com/errata/RHSA-2026:19712 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-23T16:46:32Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33236.json
Source Advisory: vulnrichment/CVE-2026-33236
[{'Exploitation': 'poc'},
{'Automatable': 'yes'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]