CVE catalog
CVE-2021-3842
nltk: CVE-2021-3842
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.46% · Oct 25, 2026
nltk is vulnerable to Inefficient Regular Expression Complexity
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | nltk | sid | 3.10.3-1 | fixed |
| Debian | nltk | forky | 3.10.3-1 | fixed |
| Debian | nltk | trixie | 3.9.1-2 | fixed |
| Debian | nltk | bookworm | 3.8-1 | fixed |
| Ubuntu | nltk | pro | 3.4.5-1 | vulnerable |
| Ubuntu | nltk | pro | 3.4.5-2 | vulnerable |
| Ubuntu | nltk | pro | 3.4.5-2ubuntu0.1~esm1 | vulnerable |
| Ubuntu | nltk | pro | 3.4.5-2ubuntu0.1~esm2 | fixed |
| Ubuntu | nltk | pro | 3.4.5-1 | vulnerable |
| Ubuntu | nltk | pro | 3.4.5-2 | vulnerable |
| Ubuntu | nltk | pro | 3.4.5-2ubuntu0.1~esm1 | vulnerable |
| Ubuntu | nltk | pro | 3.4.5-2ubuntu0.1~esm2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nltk | source | sid | 3.6.7-1 | not yet assigned | Not reported | [1003142] |
| Debian | nltk | source | forky | 3.6.7-1 | not yet assigned | Not reported | [1003142] |
| Debian | nltk | source | trixie | 3.6.7-1 | not yet assigned | Not reported | [1003142] |
| Debian | nltk | source | bookworm | 3.6.7-1 | not yet assigned | Not reported | [1003142] |
| Ubuntu | nltk | deb | pro | 3.4.5-2ubuntu0.1~esm2 | Not reported | USN-7365-1 | Not reported |
| Ubuntu | nltk | deb | pro | 3.4.5-2ubuntu0.1~esm2 | Not reported | UBUNTU-CVE-2021-3842 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-nltk]Fixed
Source package: [nltk]
Details (2)
3.8-1· all · bookwormFixed · Fixed:
3.6.7-1dsa · nltk · debian · bookworm; dsa · nltk · debian · 12
3.8-1· all · bookwormFixed · Fixed:
3.6.7-1dsa · nltk · debian · bookworm; dsa · nltk · debian · 12
[Debian 13 (Trixie)]
- [python3-nltk]Fixed
Source package: [nltk]
Details (2)
3.9.1-2· all · trixieFixed · Fixed:
3.6.7-1dsa · nltk · debian · 13
3.9.1-2· all · trixieFixed · Fixed:
3.6.7-1dsa · nltk · debian · 13
Observed: