Vendor
Nltk vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 21 vulnerabilities in Nltk: 0 in the last 7 days and 12 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, NLTK Pl196xCorpusReader quadratic ReDoS on malformed TEI blocks, was published on 27 August 2026. Nothing was published in the last eight weeks. 1 technology has a page of its own.
- Last 7 days
- 0
- Last 90 days
- 12
- Critical, all time
- 1
- Exploited in the wild
- 0
About Nltk
Python library for natural language processing tasks including tokenization, stemming, and parsing.
Nltk technologies
- Nltk6
Latest Nltk vulnerabilities
- NLTK Pl196xCorpusReader quadratic ReDoS on malformed TEI blockslowCVSS 3.7
- NLTK PorterStemmer quadratic-time DoS via long runs of 'y'highCVSS 7.5
- CVE-2026-81725: NLTK Pl196xCorpusReader quadratic ReDoS on malformed TEI blocksmediumCVSS 4EPSS 0.4%
- CVE-2026-80206: NLTK tgrep regular expression denial of servicehighCVSS 5.9EPSS 0.4%
- NLTK corpus reader sandbox bypasshighCVSS 8.2
- CVE-2026-79657: NLTK remote code execution via unsafe pickle deserializationcriticalCVSS 9.8EPSS 1.3%
- NLTK untrusted search path in Graphviz dot invocationhighCVSS 7.8
- CVE-2026-78681: NLTK entity-expansion denial of service via ElementTree parsinghighCVSS 7.5EPSS 0.5%
- CVE-2026-65915: NLTK FileSystemPathPointer sandbox bypass arbitrary file readmediumCVSS 6.5EPSS 0.4%
- CVE-2026-63312: NLTK StreamBackedCorpusView pathsec.ENFORCE bypasshighCVSS 7.5EPSS 0.7%
- CVE-2026-63310: Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.highCVSS 7.1
- CVE-2026-62384: NLTK FramenetCorpusReader symlink sandbox bypasshighCVSS 7.5EPSS 0.7%
- CVE-2026-12372: NLTK network URL validation permits SSRF to RFC 6598 shared-address-space hostslowCVSS 3.7EPSS 0.3%
- CVE-2026-12259: NLTK missing post-download integrity verificationmediumCVSS 6.5EPSS 0.1%
- CVE-2026-12074: NLTK path traversal in FramenetCorpusReader allows arbitrary XML readhighCVSS 7.5
- CVE-2026-12252: NLTK arbitrary code execution in Stanford interface classeshighCVSS 7.8EPSS 0.2%
- CVE-2026-54293: NLTK path traversal via URL-encoded separators in nltk.data.loadhighCVSS 7.5EPSS 0.6%
- CVE-2026-33236: NLTK path traversal in downloader componenthighCVSS 8.1EPSS 0.6%
- CVE-2026-33231: NLTK unauthenticated remote shutdown in WordNet BrowserhighCVSS 7.5EPSS 1.5%
- CVE-2026-0846: NLTK arbitrary file read in nltk.util.filestringhighCVSS 8.6EPSS 0.5%
- CVE-2021-3828: PYSEC-2021-356 - nltk is vulnerable to Inefficient Regular Expression ComplexitylowCVSS 3.1EPSS 1.7%
Most severe Nltk vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-79657: NLTK remote code execution via unsafe pickle deserializationcriticalCVSS 9.8EPSS 1.3%
- CVE-2026-0846: NLTK arbitrary file read in nltk.util.filestringhighCVSS 8.6EPSS 0.5%
- NLTK corpus reader sandbox bypasshighCVSS 8.2
- CVE-2026-33236: NLTK path traversal in downloader componenthighCVSS 8.1EPSS 0.6%
- CVE-2026-12252: NLTK arbitrary code execution in Stanford interface classeshighCVSS 7.8EPSS 0.2%
- NLTK untrusted search path in Graphviz dot invocationhighCVSS 7.8
- CVE-2026-33231: NLTK unauthenticated remote shutdown in WordNet BrowserhighCVSS 7.5EPSS 1.5%
- CVE-2026-63312: NLTK StreamBackedCorpusView pathsec.ENFORCE bypasshighCVSS 7.5EPSS 0.7%
- CVE-2026-62384: NLTK FramenetCorpusReader symlink sandbox bypasshighCVSS 7.5EPSS 0.7%
- CVE-2026-54293: NLTK path traversal via URL-encoded separators in nltk.data.loadhighCVSS 7.5EPSS 0.6%
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 4 | 0 | |
| 24 Aug 2026 | 8 | 1 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Nltk vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/vendors/nltk)<a href="https://junglewise.ai/threats/vendors/nltk"><img src="https://junglewise.ai/threats/vendors/nltk/badge.svg" alt="Nltk vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/vendors/nltk.json, and this page as text at https://junglewise.ai/threats/vendors/nltk.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Nltk vulnerabilities", https://junglewise.ai/threats/vendors/nltk, 9 November 2026.