CVE catalog
CVE-2021-3828
nltk: CVE-2021-3828
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.59% · 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 | fixed |
| Opensuse | python-nltk | tumbleweed | 3.7-1.1 | fixed |
| Opensuse | python-nltk | tumbleweed | 3.9.1-2.4 | 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 | fixed |
| Ubuntu | nltk | 22.04 | 3.5-1 | vulnerable |
| Ubuntu | nltk | 22.04 | 3.6.5-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nltk | source | sid | 3.6.5-1 | not yet assigned | Not reported | [995226] |
| Debian | nltk | source | forky | 3.6.5-1 | not yet assigned | Not reported | [995226] |
| Debian | nltk | source | trixie | 3.6.5-1 | not yet assigned | Not reported | [995226] |
| Debian | nltk | source | bookworm | 3.6.5-1 | not yet assigned | Not reported | [995226] |
| Ubuntu | nltk | deb | pro | 3.4.5-2ubuntu0.1~esm1 | Not reported | USN-5215-1 | Not reported |
| Opensuse | python-nltk | rpm | tumbleweed | 3.7-1.1 | Not reported | OPENSUSE-SU-2024:11958-1 | Not reported |
| Opensuse | python-nltk | rpm | tumbleweed | 3.9.1-2.4 | Not reported | OPENSUSE-SU-2025:15099-1 | Not reported |
| Ubuntu | nltk | deb | pro | 3.4.5-2ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2021-3828 | Not reported |
| Ubuntu | nltk | deb | 22.04 | 3.6.5-1 | Not reported | UBUNTU-CVE-2021-3828 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [python313-nltk]Unknown
Source package: [python-nltk]
Details (1)
3.10.3-1.1· noarch · tumbleweedUnknown · Fixed:
3.7-1.1, 3.9.1-2.4Version impact unknown
dsa · python-nltk · opensuse · tumbleweed
- [python314-nltk]Unknown
Source package: [python-nltk]
Details (1)
3.10.3-1.1· noarch · tumbleweedUnknown · Fixed:
3.7-1.1, 3.9.1-2.4Version impact unknown
dsa · python-nltk · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [python3-nltk]Fixed
Source package: [nltk]
Details (2)
3.8-1· all · bookwormFixed · Fixed:
3.6.5-1dsa · nltk · debian · bookworm; dsa · nltk · debian · 12
3.8-1· all · bookwormFixed · Fixed:
3.6.5-1dsa · 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:
3.6.5-1dsa · nltk · debian · 13
3.9.1-2· all · trixieFixed · Fixed:
3.6.5-1dsa · nltk · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2022_10040-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-3828]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-3828]
- [https://osv.dev/vulnerability/USN-5215-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2024:11958-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2025:15099-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-3828]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]