CVE•Published 2026-08-26•Modified 2026-09-03•0 articles on news•6 live references•NVD data

CVE-2026-80205Nltk · Nltk

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 69% of all CVEs

Weaknesses (CWE)

CWE-1333Inefficient Regular Expression Complexity

Description

NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and TokenSearcher.findall() methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking, resulting in indefinite CPU saturation and denial of service to all users of the Python process.

Timeline

Published 2026-08-26

Modified 2026-09-03

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-80205

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Nltk Nltk"

All exposed Nltk Nltk instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Nltk"

HTTP body or banner mentions "Nltk" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-80205