Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-62388

CVE-2026-62388HIGH

NLTK before 3.10.0 Insecure Default Configuration in pathsec.py

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   H   N   N    8.7   .0051   41.6     —

AFFECTED
  Product  Versions     Fixed
  nltk     unspecified  3.10.0

TIMELINE
  Jul 13  Reserved by VulnCheck
  Aug 22  Published (CNA: VulnCheck)
  Aug 27  EXPLOIT PUBLISHED — CVE-2026-62388 (nltk). Public exploit reference added.

CWE-1188 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

Description

NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only active when manually enabled.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 13, 2026	Reserved	Reserved by VulnCheck
August 22, 2026	Published	Published (CNA: VulnCheck)
August 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-62388 (nltk). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
nltk	nltk	—	—	3.10.0

Weaknesses

CWE-1188

References (2)

https://github.com/nltk/nltk/security/advisories/GHSA-p3m8-78j2-g5p3 [vendor-advisory]
https://www.vulncheck.com/advisories/nltk-before-insecure-default-configuration-pathsec [third-party-advisory]

Authoritative record: CVE-2026-62388 at cve.org

Vendors: nltk

Weaknesses: CWE-1188

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-62388 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.