Description
nltk is vulnerable to Inefficient Regular Expression Complexity
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nltk | nltk/nltk | unspecified – ≤ 3.6.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nltk | 3.6.5-1 | — |
| Debian 13 | nltk | 3.6.5-1 | — |
| Debian 12 | nltk | 3.6.5-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | nltk | 3.6.5-1 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | nltk | 3.4.5-2ubuntu0.1~esm1 | USN-5215-1 |
| Ubuntu Pro 18.04 LTS | nltk | 3.2.5-1ubuntu0.1+esm1 | USN-5215-1 |
| Ubuntu Pro 16.04 LTS | nltk | 3.1-1ubuntu0.1+esm1 | USN-5215-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | python-nltk | 3.7-bp152.3.3.1 | openSUSE-SU-2022:10040-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-nltk | 3.7-1.1 | openSUSE-SU-2025:15099-1, openSUSE-SU-2024:11958-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | nltk | < 3.6.4 | 3.6.4 | GHSA-2ww3-fxvq-293j |
Advisories 4
- USN-5215-1 nltk vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- openSUSE-SU-2024:11958-1 python310-nltk-3.7-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:15099-1 python311-nltk-3.9.1-2.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:10040-1 Security update for python-nltk SUSE / openSUSE Security Updates · May 7, 2025