EUVD-2025-210509
GHSA-848c-c2cx-j7qx
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Eval input sanitization
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Jul 26, 2026
Local code injection in NLTK versions prior to 3.9.3 allows an attacker with low privileges who can invoke the collocations module via the command line to execute arbitrary Python code. A publicly available proof-of-concept exploit demonstrates passing a crafted argument to the BigramAssocMeasures.eval() call, enabling arbitrary code execution including OS commands. The vulnerability has been patched in NLTK 3.9.3.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in pypi, euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
DescriptionCVE.org
NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute arbitrary Python code. When collocations.py is invoked directly, the __main__ block passes command-line arguments directly to eval() as suffixes of BigramAssocMeasures without allowlist validation or sanitization, enabling an attacker to supply a Python expression that escapes the intended attribute lookup and executes arbitrary code including OS commands via the os module.
Blast Radius
ecosystem impact- 7 pypi packages depend on nltk (7 direct, 0 indirect)
Ecosystem-wide dependent count for version 3.9.3.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
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Same weakness CWE-95 – Eval Injection
View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Package Hub 15 SP7 | Fixed |
| SUSE Package Hub 15 SP7 | Affected |
Exploit-DB