CVE-2026-126295

Description

NLTK from 3.10.0 before 3.10.4 contains an arbitrary file read vulnerability in BllipParser that allows attackers to open files outside NLTK data roots by supplying unvalidated model paths. Attackers controlling parser_model, reranker_features, reranker_weights, or from_unified_model_dir() input can make the bllipparser C extension read sensitive files or block on FIFOs and devices.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 7.0CVSS 4.0, Highfrom the CNA (VulnCheck)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
• 6.8CVSS 3.1, Mediumfrom the CNA (VulnCheck)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 13 Nov 2026 Published

Weakness

• CWE-22

References

• GitHub Security Advisory (GHSA-fg9w-wfp5-j933)vendor-advisory
• VulnCheck Advisory: NLTK 3.10.0 before 3.10.4 Arbitrary File Read via BllipParser Model Pathsthird-party-advisory