CVE•Published 2026-08-22•Modified 2026-09-16•1 article on news•4 live references•NVD data

CVE-2026-71513Nltk · Nltk

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 46% of all CVEs

Weaknesses (CWE)

CWE-502Deserialization of Untrusted Data

Description

NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft untrusted transition-parser models that execute arbitrary commands when TransitionParser.parse loads the model through allowlisted_pickle_load.

Timeline

Published 2026-08-22

Modified 2026-09-16

External references

NVD MITRE Exploit-DB 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-2026-71513

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-2026-71513