Description
nltk is vulnerable to Inefficient Regular Expression Complexity
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nltk | nltk/nltk | unspecified – < 3.6.6 | 3.6.6 |
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 | 3.6.7-1 | — |
| Debian 13 | nltk | 3.6.7-1 | — |
| Debian 12 | nltk | 3.6.7-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | nltk | 3.4.5-2ubuntu0.1~esm2 | USN-7365-1 |
| Ubuntu Pro 18.04 LTS | nltk | 3.2.5-1ubuntu0.1+esm2 | USN-7365-1 |
| Ubuntu Pro 16.04 LTS | nltk | 3.1-1ubuntu0.1+esm2 | USN-7365-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | nltk | 2.0~b9-0ubuntu4.1~esm4 | USN-7365-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | nltk | < 3.6.6 | 3.6.6 | GHSA-rqjh-jp2r-59cj |
Advisories 1
- USN-7365-1 nltk vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026